The author describes the atmosphere in the tunnel leading to smaug's lair this way:

also it was undoubtedly hot in the tunnel. wisps of vapor floated up and past him [bilbo] and he began to sweat. a sound, too, began to throb in his ears, a sort of bubbling like the noise of a large pot galloping on the fire, mixed with a rumble as of a gigantic tom-cat purring.

which words best describe the mood this passage creates?

a. lonely and sorrowful.

b. peaceful and pleasant.

c. tense and uncomfortable.

d. sad and wistful.