$60\%$ of all students in a class commute by public transportation. If $30\%$ of the students aspire to be scientist

$60\%$ of all students in a class commute by public transportation. If $30\%$ of the students aspire to be scientists, which of the following can be the percentage of students who do not commute by public transportation and do not aspire to be scientists?

I. $5\%$
II. $30\%$
III. $60\%$

(A) I only
(B) II only
(C) III only
(D) I and II only
(E) I, II, and III

Answer: B

Source: e-GMAT

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