How does steroid hormone influence the cellular activities?

Identify $A, B$ and $C$ in the diagrammatic representation of the mechanism of hormone action.
Select the correct option from the following:

The name 'second messenger' is given to

Hormones are . . . . . . .

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: $FSH$,which interacts with membrane-bound receptors,does not enter the target cell.
Reason $(R)$: Binding of $FSH$ to its receptors generates a second messenger (cyclic $AMP$) for its biochemical and physiological responses.
In the light of the above statements,choose the most appropriate answer from the options given below:

Which of the following is not a protein hormone?