A would be the correct answer because you are looking for the value. What you could do is make a table and put the numbers in it. Then you can go through all of the choices and see which one works. For example: An=-1+6n. I did -1+6*1 for the first term and got 5 then 11 and then 17. keep on putting the numbers in until you find what you are looking for. When asked for the nth term, that is the place, so you would plug in the number from the term before that.
