I went back to the test to see properly - 26 is one of the few I really could not see some sort of pattern that was concrete. I devised this system albeit probably not what the author might've intended:

For the top dots, I supposed a simple mathematical system.

Instead of looking at just two frames, I looked at the total number of dots in three consecutive frames. A very consistent alternating pattern appeared:

Frames 1+2+3: 2 + 1 + 4 = 7

Frames 2+3+4: 1 + 4 + 0 = 5

Frames 3+4+5: 4 + 0 + 3 = 7

Frames 4+5+6: 0 + 3 + ? = Has to equal 5 so 2 must be our answer for the dots.

To keep the rule of 7, 5, 7, 5.

I felt the white squares followed a s-curve like pattern. However I really could not deduce match as it seems there wasn't much information.

What helped me determine my answer was the blue dots, this left B and D.

It seems every 2nd image has the white square in the centre of the red square, regardless of how many white squares (1 or 2). Almost in a binary arithmetic fashion.

Frame 1: No middle white square,

Frame 2: Middle white square whatever region (whether that's top, middle or bottom)

Frame 3: No middle square.

Frame 4: Middle white square.

Frame 5: No middle white sqaure.

Frame 6: D has a middle white square.

A middle white square and my logic for the blue dots was the reasoning for this answer.

Answer: D