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Interpreting definite integrals in context

The population of a town grows at a rate of

r (t)

people per year (where

t

is time in years). At

t = 3

, the town's population was

1000

people.

What does $1000 + \int_{3}^{8} r (t) d t = 1500$ ‍ mean?

(Choice A)
The average rate at which the population grew between $t = 3$ ‍ and $t = 8$ ‍ is $1500$ ‍ people per year.
(Choice B)
The town's population grew by $1500$ ‍ people between $t = 3$ ‍ and $t = 8$ ‍.
(Choice C)
The town's population grew at a rate of $1500$ ‍ people per year at $t = 8$ ‍.
(Choice D)
At $t = 8$ ‍, the town's population was $1500$ ‍ people.

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AP®︎ Calculus BC (2017 edition)