An insect population after `x` months can be modeled by the function `g(x)=15(1.2)^{x}`. Which statement is the best interpretation of one of the values in this function?
Answer choices: The insect population increased at a rate of 20% each month The insect population increased at a rate of 12 each month The insect population decreased at a rate of 12 each month The insect population decreased at a rate of 20% each month