Answer:
A
Explanation:
The first color was blue then the color changed to red then back to blue. You can infer that the next color is going to be red.
Now you can eliminate choices B and C.
The first paterent is 1 then it goes to 2 then it goes to 2 with a full line through it. Choice D has only a partial line so you can infer and that is in not choice D.
Now all that is left is choice A.