Why Is the Capsid an Important Part of the Structure

Why is the capsid an important part of the structure of the virus?

A) It allows for the virion to withstand harsh environments until it infects a cell
B) It is easily shed when the virion enters into the host cell
C) It selectively allows certain agents to penetrate the coat and enter into the virion
D) It allows the virion to withstand harsh environments and is easily shed when it enters the host cell
E) It allows the virion to withstand harsh environments and selectively allows certain agents to penetrate the coat and enter the virion