Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): No test provides a perfect picture of a student's abilities and skills. A test is only one small sample of student's a performance.

Reason (R): In the light of the above statements, choose the most appropriate answer from the options given below:

The correct option is: Both (A) and (R) are correct and (R) is the correct explanation of (A).

Let us analyze the statements step-by-step to understand why this option is correct:

1. Analyzing Assertion (A): "No test provides a perfect picture of a student's abilities and skills."
This statement is correct. Educational and psychological testing experts agree that any single test is limited in scope, time, and format. It cannot capture the entirety of a student's diverse intelligence, creativity, practical skills, or overall academic potential. Therefore, a test is indeed only one small sample of a student's performance.

2. Analyzing Reason (R): "In the light of the above statements..."
In standard assessment theory, the reason why a test cannot provide a perfect picture (Assertion A) is precisely because it only samples a tiny fraction of what a student knows or can do at a single point in time. Because a test is merely a limited sample of behavior under specific conditions, it is inherently unable to offer a complete or flawless representation of a student's total abilities. Thus, the reasoning directly explains the limitation stated in the assertion.

Therefore, both the Assertion (A) and the Reason (R) are correct statements, and the Reason (R) provides the logical explanation for why the Assertion (A) is true.