In terms of its register, which of these sentences is the odd one out?

A. A mass reduction device is composed of an inner wall, an outer wall, and an array of high-frequency microwave emitters.

B. Privately owned camping sites must have and display a license from the local council.

C. To get a new energy certificate for your home, business, or public building, you need to have it assessed.

D. You need a license to keep some animals considered to be wild, dangerous, or exotic, such as bears, venomous snakes, jellyfish, and kangaroos.​