Evaluate c(7, 7). a: 0 b: 1 c: 7 if you can, could you explain how you got your answer. these problems honestly don't make any sense to me and i'm turning towards here as a last resort. in advance.

If you're seeing these problems as part of your study of statistics, you should know that
  C(n, k) = n!/(k!×(n-k)!)
where the "!" indicates the factorial, the product of all positive integers less than or equal to the given one.

Then C(7, 7) = 7!/(7!×0!) = 1/0!
You are supposed to know also that 0! ≡ 1, so C(7, 7) = 1.

This is the number of ways you can choose 7 objects from a pool of 7 objects without regard to order. (You can do it one (1) way: choose all of them.)

The appropriate choice is ...
  B: 1

Coral reefs,temperate grasslands, and kelp forests are all in danger.