Sally Is Asked 10 Questions and Is Told to Give $15 \%$

Multiple Choice

Sally is asked 10 questions and is told to give her answer in intervals such that $15 \%$ of the time the correct answer fell above the interval and $15 \%$ of the time the answer fell below the interval. The experimenter concludes that Sally is overconfident. For how many questions did the true answer fall within Sally's given intervals?

A) 8
B) 6
C) 7
D) 9