An adaptation is a trait that enables an organism to survive and reproduce selects which species live in water or land ensures a particular species’ extinction keeps organisms changing in their environments

Option A, enables an organism to survive and reproduce

Explanation:

Adaptation is the mechanism through which an organism become enabled to survive and reproduce  in certain environmental condition.

For example - in older days "coil mosquito repellents" were used to kill the mosquitoes but eventually the mosquitoes have evolved and became resistant to the deadly effects of "coil mosquito repellent" . This resistance is a form of adaptation to the existing environmental condition. Thus, from here it is also clear that a species or organism adapts to a changing situation though natural selection process in order to become the "fittest for survival".

Therefore option A, is correct.

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.