which of these correctly fills in the blank to complete paragraph proof?

To prove that a given number n is odd, we can assume that n is even, and then derive a contradiction. Here is a proof by contradiction:

Assume that n is even.

Then n can be expressed in the form n = 2k, where k is an integer.

Therefore, n/2 = k is also an integer.

But this contradicts the fact that n is odd.

Therefore, our initial assumption that n is even must be false, which means that n must be odd.