"State two reasons" - what happens if...

What happens if when it asks to state two reasons we list 3, and it turns out one of them is wrong and the other two are right?

They will only grade the first two you write down

^ correct

Why would you list three? You’re just wasting time.

This page is a must read:

http://www.cfainstitute.org/programs/cfaprogram/exams/Pages/level_III_exam_prep.aspx