where is the rest of the question?
hello there! the answer is a trait that an organism survive and reproduce in its environment.
an adaptation is something an animal develops naturally to better live in its environment, making a your best option.
it's not b or d because adaptations are the animal's changes, not the environment. it's not c because although how they obtain food may be part of it, it is not the full thing.
i hope this was and answered your question, have a great rest of your day!
plants are able to make their own food in their leaves.
they mostly do it in their leaves because that is where the chloroplast is and it holds chlorophyll which causes photosynthesis (the process of making food for a plant.)
hopefully my answer ! ♡
(if my answers you tell me, therefore i know.. that i did them correctly or incorrectly. anyways, have a great day/night! )