If a Female Ate 100 Extra Calories Per Day in Excess

If a female ate 100 extra calories per day in excess of her needs, approximately how many days would it take her to gain one pound if energy expenditure remained constant?

A) 7 days
B) 14 days
C) 1 month (30 days)
D) 1 month + 1 week (35 days)
E) 1 month + 2 weeks (42 days)