7 people like nachos ..right?
4 people like pizza ..right?
1 person doesn't like pizza or nachos..
draw two circles, make sure they intersect
in the space where they intersect mark a 3 [those that like both nachos and pizza]
now since 7 people like nachos, and at least 3 of those also like pizza in the nachos circle mark 4 i.e. 7 -4 =3
and since 4 people like pizza, but 3 of those like both pizza and nachos, mark 1 in the pizza circle.
outside of the 2 circles mark 1 because this is the 1 person that doesnt like either nachos or pizza
people in nachos only =4
people in pizza only = 1
people that like both pizza and nachos = 3
people that dont like either nachos or pizza = 1
if they are all members of the club 4 + 1+ 3 + 1 = 9 members in total
Answer (B)