Answer: Option A. To protect the organism
Step-by-step explanation:
The given picture is of a turtle and it is showing a structure of shell that functions for the protection of animal.
The shell is the outer covering of the turtle which is made of skeletal and dermal bone which helps in providing structural framework and protection against prey. This is a very hard substance that acts as a shield and also able to survive fossilization.
It also helps the turtle to survive in the extreme condition as it get hide inside its shell.
Hence, the correct option is A.