I would have answered (a) and (b), given the opportunity.
I am not sure who gives me the ability to read Tarot, but since I am religious AND believe that psychic abilities are gifts from Above, then it figures that I should attribute the talent of foresight to Whoever made us.
However, as long as you believe what you are getting, the tarot works for anyone, even a sceptic such as my boyfriend (came up perfectly for him!) so I suppose I am firmly in the Other category in that synchronicity can be explained in various ways. My boyfriend is a Catholic, but although he goes to religious events such as Taize I wouldn't say he has thought very deeply about religion, and he doesn't really believe in an activist God. However after meeting me he has started to get more inclined towards looking at his own faith. He wasn't actually that surprised at how accurately the tarot both explained his present and predicted his future - I was using my "fortune-telling" spread and patter with him, and I am fully accepting of the fact that tarot can and does predict what is going to happen tomorrow or in a week's time or in a year's time; I have no problem with that as the information is still cryptic enough to give us latitude to exercise free will; I know roughly what the political future of the UK is, at least for the next year or so, but not knowing how it will happen or when it will occur I still have a role to play in politics; I know full well that my spirit guide has given me several big kicks in the a*** lately to get me moving and making waves out there. In fact the major cause of the depression I have suffered for the last two years is knowing too much rather than too little and not being able to articulate it in any coherent form or back it up with authoritative statistics. Understanding a psychic or spiritual form of guidance, whether through tarot or other augury, is making a whole lot more sense than previously, and also helping focus my own work in those areas which I have chosen or been chosen to focus on so that the goals are achieved and what is destined comes to pass.
That is why I am not sure that I want to go into tarot as a full-time pracitioner: during a sermon on the Holy Spirit this morning (it being Pentecost) the preacher told us all the ways we could use Spirit to bolster the Church of England, and not all the ways we could use it to help the world. I will give her the benefit of the doubt and say she was taking it for granted that we were good citizens, each in our own way, and applied our beliefs to the way we work in the world, but still, the Church saw itself as an end in itself rather than a means to effect change based on its beliefs.
But at the end of the day, none of us know as mortals what is out there, and so we are all entitled to our own view of how things work. Most agnostics or religious sceptics I know, actually, are more turned off by the antics of religious politics than by any idea of God/dess or Spirit. I have also met clergy who are bordering on the atheist but who are able to justify their faith through their belief in community and fellowship of worship rather than any mystical tradition.
Horses for courses I suppose.