Question

The 130 consumers were asked about their buying preferences concerning another product that is sold in the market under three labels. The results were


12 buy only those sold under label A.
24 buy only those sold under label B.
27 buy only those sold under label C.
14 buy only those sold under labels A and B.
9 buy only those sold under labels A and C.
11 buy only those sold under labels B and C.
7 buy the product sold under all three labels.


How many of the consumers surveyed buy the product sold under none of these labels?


a. 106
b. 89
c. 41
d. 24
e. 19

This is confusing. Please explain. Thank you