which word describing the mood this passage creates is the most inaccurate?

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.

a) suspenseful

b) pleasant

c) uncomfortable

d) tense