Find the number that does not fit with the others.

D. 20

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 FOR A.

Assertion (A): Reading improves vocabulary. Reason (R): A larger vocabulary enhances communication skills. Which of the following is correct?

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

Assertion (A): Logical reasoning is essential for problem-solving. Reason (R): Problem-solving requires critical thinking skills. Which of the following is correct?

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

Assertion (A): All birds can fly. Reason (R): Flying is a characteristic of birds. Which of the following is correct?

D. A IS FALSE, BUT R IS TRUE.