I read the examples , but think this answer is still correct. am I missing something ?

Hi Heather, 

I would say the two possibilities are -

Ce pull va mal à Alain

Ce pull ne va pas à Alain

for,

this sweater doesn't suit Alain 

but it depends on what they were testing in the quiz.

Please use the Report it button on your correction board for these types of quiz queries as I can only give a general answer.