Poor print quality and a lot of information. So here goes!
Just noticed I have put a ring around it which suggests I told DD to ignore it!
First letter only one pair, BB, so proceed with caution, common feature one large black ball or two small white.
Second letter two XX and two YY, looks better, XX two white different sizes, YY nothin!
Test shape, two large white so extrapolate two small white as two white the same, gives B.., only one B.. answer, so I say BZ, answer e. Trying to double check what does Z mean, no idea.
Book says, answer a, me fail!
Lesson to learn, in a timed section NVR test apply the logic, best guess and move on.