Verified Answer :

The answer is letter A. 

Dogs grow a thick coat fur during winter because they are adapting to change. Adaptations are
the result of evolution in different living organisms. This process occurs amazingly
through gene mutation but it takes a very long period in time. Adaptation
processes occur to help species survive and thrive in the ecological balance of
life.

Structural adaptations are physical features of an organism that adapted
through time. An example of this is the thick coat of fur that dogs naturally grow to protect themselves from the change of the weather.

In winter many dogs grow a thick coat of fur. This is an example of

Answer is A. adapting to change.

because when it is winter they get thicker coat of fur so they can stay warm.