Question

An adaptation is a trait that ___.

Answer 1

It would be the last one. ' enables an organism to survive and reproduce.'

I was going to say C, but adaptions are changes, so they wouldn't continuously change.

Adapting helps the organism change in order to develop in its environment

Hope this helps :)

Answer 2

adaptation is the evolutionary process whereby an organism becomes better able to live in its habitat or habitats... an adaptive trait is an aspect of the developmental pattern of the organism which enables or enhances  the probability of that organism surviving and reproducing.