Write the next sentence in the following story.

How to breed freshwater angelfish
Use a 20 gallon tank.
Before you begin breeding, you must set up the spawning tank of 20 gallons or larger. Set it up at least 3 months in advance to make sure the conditions are ideal.

Choices: (a). Call hnatocentesis to ask when you can prepare the tank. Walk 20 yards away from the spawning site you want to breed your angelfish in and have it setup and tested by your local tank support team.; (b). A 20 gallon tank is best because angelfish need a tall tank to accommodate their large size. If an angelfish feels cramped, they will not feel secure and will not spawn.; (c). An average 25 gallon tank is 60 gallons or less. If you are going to purchase fish, consider leaving the tank at least 3 months in advance of breeding to keep the availability of fish at a desirable rate.; (d). This will enable the new angelfish to have enough room to roam the tank. This method is more expensive than the original method, but is still good enough to make even the most experienced angelfish.;. The answer should be
(b).