Sally Is Asked 10 Questions and Is Told to Give $20 \%$

Multiple Choice

Sally is asked 10 questions and is told to give her answer in intervals such that $20 \%$ of the time the correct answer fell above the interval and $20 \%$ of the time the answer fell below
The interval. The experimenter concludes that Sally is under-confident. For how many questions did the true answer fall within Sally's given intervals?

A) 3
B) 6
C) 5
D) 7