A) in A we see four numbers, they can all be multiplied by the following two numbers, 1 and 2. Two is the greatest so it is the GCF
B) here we see three numbers, all are x to a power. We can see that they can be multiplied by two numbers, x and 1.
C) in c we see numbers attached to variables that are attached to powers. The GCF here is 2x.
Hope this helps! Please make me the brainliest, it’s not necessary but appreciated, I put a lot of effort and research into my answers. Have a good day, stay safe and stay healthy.