Which of the following can be called Gerund:

(A) Stop playing.
(B) I love to go hunting.
(C) Kids are sleeping.
(D) Seeing is believing.
(E) They are smoking outside.

Choose the correct answer from the options given below:

(A), (B), (D) Only

The correct answer is Option (2) → (A), (B), (D) Only

A gerund is an -ing form of a verb used as a noun.

(A) Stop playing.

"Playing" is the object of the verb "stop" → Gerund

(B) I love to go hunting.

"Hunting" is the object of the phrase "to go hunting" → Gerund

(C) Kids are sleeping.

"Sleeping" is the main verb (present continuous), NOT a gerund 

(D) Seeing is believing.

Both "Seeing" and "believing" function as nouns → Gerunds

(E) They are smoking outside.

"Smoking" is part of the verb phrase "are smoking" → Not a gerund