Schweser Practice Exam Vol1 Exam 2 Afternoon

Can somebody clarify the answer for Q74, Pg 117 Schweser PE Vol 1. I think the answer should be B and I am confused with the explanation at the back. Thx

IRR is not useful for comparing several projects. A is right. it says least likely incase it was just a reading error

Ohhhhh…silly me…yup it was a reading error. Thx

NPV>IRR All day Everyday Twice on Sunday.