A biologist is studying two different bacterial colonies, Colony A and Colony B.

Colony A starts with $500$ bacteria, and its population increases by $150$ bacteria every hour.

Colony B starts with $200$ bacteria, and its population increases by a factor of $1.2$ every hour.

Let $P_A$ be the population of Colony A after $h$ hours, and $P_B$ be the population of Colony B after $h$ hours. Which of the following equations correctly models the population of Colony B?