Each week, Tim wants to increase the number of sit-ups he does daily by 2 sit-ups. The first week, he does 15 sit-ups each day.

Write a function in the form f(n)=mn+b to represent the number of sit-ups, f(n), Tim does daily in week n.
A. f(n)=2n+13
B. f(n)=2n+15
C. f(n)=n^2+15
D. f(n)=2n^2+15

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