To set up your fish aquarium, you must first decide where to put your tank. You should place your fish tank on a stable, sturdy piece of furniture, such as a table. Pick a spot away from direct sunlight, as direct sunlight can harm some fish. After placing your tank in its chosen spot, place a small layer of pebbles at the bottom of the aquarium. Then, put a few underwater plants or other decorations on top of the pebble layer. After adding decorations, fill the tank with water. Because the water will make the tank heavy, fill the tank by using a clean pitcher filled with water. That way, you will not have to move your tank after it is full of water. Finally, put your new fish into your aquarium.

Which of these choices is the BEST topic sentence for the composition?

A) Getting a new pet can be a fun and rewarding experience.
B) Setting up an aquarium takes quite a bit of work and planning.
C) Fish make good pets because they do not require a lot of work.
D) To keep your fish healthy, you must regularly clean its aquarium.