Assertion (A): All mammals are warm-blooded animals. Reason (R): Warm-blooded animals can regulate their body temperature internally. Which of the following is correct?

A. BOTH A AND R ARE TRUE, AND R IS THE CORRECT EXPLANATION OF A.

Assertion (A): Water boils at 100 degrees Celsius at sea level. Reason (R): The boiling point of water decreases with altitude.

A. BOTH A AND R ARE TRUE, AND R IS THE CORRECT EXPLANATION FOR A.

Assertion (A): All squares are rectangles. Reason (R): Rectangles have four sides. Which of the following is correct?

B. BOTH A AND R ARE TRUE, BUT R IS NOT THE CORRECT EXPLANATION OF A.

Assertion (A): All squares are rectangles. Reason (R): All rectangles have four sides.

B. BOTH A AND R ARE TRUE, BUT R IS NOT THE CORRECT EXPLANATION FOR A.

Assertion (A): All mammals are warm-blooded. Reason (R): All warm-blooded animals are mammals.

B. BOTH A AND R ARE TRUE, BUT R IS NOT THE CORRECT EXPLANATION OF A.