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A kitten weighs 84 grams and gains 12 grams each day. The kitten's weight is
a linear function of time. Which statement best describes the rate of change
and initial value of this function?

A. The rate of change is the number of grams gained per day, and the
initial value is the first day.

B. The rate of change is the number of grams gained per day, and the
initial value is the starting weight.

C. The rate of change is the starting weight, and the initial value is
the number of grams gained per day.

D. The rate of change is the number of days per gram gained, and the
initial value is the first day.