venn

Last year in a group of 30 businesses, 21 reported a net profit and
15 had investments in foreign markets. How many of the businesses
did not report a net profit nor invest in foreign markets last year?
(1) last year 12 of the 30 businesses
reported a net profit and had investments
in foreign markets.
(2) last year 24 of the 30 businesses
reported a net profit or invested in
foreign markets, or both.

OA: B why?
My ans: D
By statement 1 we can solve the question. (aUb) = n(a) + n(b) -(common in both a nd b).
Where n(aUb) is no. of businesses reported net profit or invested in
foreign markets, or both. sufficient..
Please explain.. why not if its wrong.