Why do organisms evolve?

a
Organisms naturally select traits that help them survive and reproduce.
b
Changes in the environment cause organisms to change.
c
Organisms with traits that help them survive and reproduce in their environment pass on those traits.
d
Organisms make changes to help them survive and reproduce in their environment.

I think its c

Yes, you are correct. Organisms evolve because those with traits that help them survive and reproduce in their environment are more likely to pass on those traits to their offspring. Over time, this leads to changes in the genetic makeup of a population, resulting in evolution.