Answer: It's A. y= f(2x)
Explanation:
If you look at your notes than you can actually find the answer there.
But I did the way I was taught; I was taught by this: You always look at the x/ vertical line and then the y/ horizontal line, then look how many squares are going to be where the dots are, also, I kinda knew it in my head.
Hoped this helps! Good Luck.
~Ash W