This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to take care of baby carp
Get a 100-gallon tank.
You can purchase a fish tank at the pet store or online or you can use an outdoor pond to create your spawning pool. The larger the tank, the more room the carp will have to move around.

Options: (A). Use plenty of water to accommodate the size of your pond. Try to avoid overfill because carp thrive in moist environments, and overwater can cause dehydration. (B). An ideal tank for carp is 8x6 ft (2.43x1.82 m) and at least two feet (60.96 cm) deep. Get a tank made of non-toxic materials to promote carp propagation. (C). You can aquarium the tank, or wait to add a fish until it's six weeks old. If you chose an outdoor pond, then it's a good idea to get a 10-gallon tank because it'll be much easier to reuse when your child is grown. (D). If possible, keep the water slightly warmer since this will make it easier for them to move around inside and avoid as much water loss. Advertise your new spawning space.
The answer is:
(B).