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 FOR A.

Assertion (A): All mammals are warm-blooded. Reason (R): Birds are a type of mammal.

C. A IS TRUE, BUT R IS FALSE.

Assertion (A): All mammals are warm-blooded. 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): All birds can fly. Reason (R): Penguins are birds. Which of the following is correct?

D. A IS FALSE, BUT R IS TRUE.

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.