closed as off-topic by Excited Raichu, gabbo1092, w l, JMP, Deusovi♦ Nov 30 '18 at 17:40
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the entire image is reflected, then the number of rectangles at the (flipped) left is doubled and the image on the right is duplicated below it.
To the added parts:
#1 is B also, the top part is reflected across the y-axis while the bottom across the x-axis.
#2 is C because the first triangle is the bottom right, the second is the bottom left, and 3rd is the top
I will go with
We see that the triangle is doubled and that they add a new line in the middle of each rectangle.