If a type of bacteria doubles each month, it means that each month has twice the amount of bacteria of the previous month. It can be modeled by an exponential function. For instance:
[tex]p=A\cdot2^{x-1}[/tex]where x is the number of months (x = 1,2,3, ...) and A the initial bacteria population, p is the bacteria population after x months.
Hence, the answer is:
B) exponential
