Solution

We need to evaluate both the Assertion (A) and the Reason (R) and determine if the Reason correctly explains the Assertion.

• Assertion (A): "Military service should be made compulsory in our country." This is a strong, debatable statement presented as a valid point of view or argument.
  
• Reason (R): "Every citizen should protect his country." This is a widely accepted patriotic and civic duty.
  

Conclusion:

The Reason (R) provides the underlying justification for the Assertion (A). The argument is that because citizens have a duty to protect their country (R), a system of compulsory military service (A) should be implemented to fulfill that duty. Therefore, both A and R are considered correct in this context, and R is the correct explanation of A.