Assertion (A): A secondary appraisal, is the assessment of ones coping abilities and resources and whether they will be sufficient to meet the harm, threat or challenge of the event.
Reason (R): The resources may be mental, physical, personal or social.

Both A and R are true, and R is the correct explanation of A

The correct answer is Option 1: Both A and R are true, and R is the correct explanation of A

Assertion (A): A secondary appraisal, is the assessment of ones coping abilities and resources and whether they will be sufficient to meet the harm, threat or challenge of the event. This is true as it correctly defines secondary appraisal as evaluating one’s coping abilities and resources to deal with a stressful situation.
Reason (R): The resources may be mental, physical, personal or social. It is also correct.

Does R explains A: Yes. Understanding the nature of the resources (mental, physical, etc.) is essential to the process of appraisal described in (A). Because these specific resources exist and vary, an individual must perform a "secondary appraisal" to see if they are sufficient for the threat. Thus, (R) provides the necessary context and detail that explains the mechanism of (A).