The Population of a Pack of Rats Can Be Represented $P(t)=2+1.3 t$

The population of a pack of rats can be represented by the formula $P(t) =2+1.3 t$ where $P(t) =2+1.3 t$ represents the population in hundreds, and $t$ represents the time, in months, since January 2010. Which of the following is correct regarding the slope.

A) Since the slope is 1.3 , we know that the population is increasing by 130 rats per month.
B) Since the slope is 2, we know that the population is increasing by 200 rats per month.
C) Since the vertical intercept is 1.3 , we know that the population is increasing by approximately 1.3 rats per month.
D) Since the slope is 1.3 , we know that the population is increasing by 130 rats per year.