In the Selected Answers Section of a Mathematics Text, There $e^{-2} 2^{8} / 8$

Multiple Choice

In the Selected Answers section of a mathematics text, there are an average of 2 incorrect answers per 1000 questions. The probability that there are 15 incorrect answers in a set of 4000 questions is

A) $e^{-2} 2^{8} / 8$ !
B) $e^{-8} 8^{15} / 15$ !
C) $e^{-4} 4^{2} / 2 !$
D) $\mathrm{e}^{-2} 8^{2} / 2$ !