#### Answer

The answer is J: They are all composite.

#### Work Step by Step

They are all composite because they have other factors that go into them other than themselves and 1. 21 has 3 and 7. 46 is even, and all even numbers after 2 are all composite because 2 will always be a factor of them. Lastly, 57 is composite because 57 is divisible by 3.