Fast its which question encourages further discussion?
is pollution a problem in the city?
does water pollution harm fish?
how is air pollution harmful?
do people care about pollution?

The third option because it asks for a full answer with reason while the other 3 just need a yes or a no.

Ibelieve the correct answer is  d. they bound logs together and built a raft. enkidu steered it down the great river. gilgamesh carried humbaba's head.we know that gilgamesh was triumphant in this battle because he is carrying his enemy's head. he defeated humbaba, and then decapitated him to have his head as a trophy, or to show it to everyone that he managed to defeat his enemy.