List of top Zoology Questions on B cell and T cell activation

Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R):
Assertion (A): Activated macrophages are more effective than resting ones in eliminating pathogens. 
Reason (R) : Activated macrophages show increased phagocytic activity and ability to activate T cells. 
In the light of the above statements, choose the most appropriate answer from the options given below