Q20

[ganbayou]

Hi, I'm still not sure why A is wrong on Game#4 Q20...I thought it does not work neither because when W2, 2MM must be at 1/3...otherwise, it would be M2M4 and no place for WY or in another case, W with Y is at 2, MM would be at 1/3, so in either case M cannot be at 2...
Is it because it does not say how many grants can be awarded 1 quarter?

[ManhattanPrepLSAT1]

So here's the diagram helping us see why (E) cannot be true:



As for answer choice (A), M can go in Q2: