Which of the following quotations contains an adverb clause explaining under what circumstances?(from the story To build a fire)
a. “When all was ready, the man reached in his pocket for a second piece of birch bark.”
b. “If he had only had a trail mate he would have been in no danger now.”
c. “As he looked apathetically about him, his eyes chanced on the dog. . . .”
d. “He could not pick and choose, for he had to lift the fuel between the heels of his hands.”

a. “When all was ready, the man reached in his pocket for a second piece of birch bark.”

Explanation:

An adverb clause are groups of words that functions as an adverb in a sentence, they can modify a verb, adjective or adverb. They elaborate on when why, how much or where an action in a sentence occur.

It begins with subordinate conjunction like "after", "because", "afterwards", etc. They are group of words that act like an adverb but not have a subject and verb.

Using an adverb clause in a sentence adds better descriptive detail to writing. They can be placed in the beginning, middle or end of a sentence.

From the options, option A contains an adverb clause because of the adverb clause "When all was ready..." as it modified the verb in "the man reached in his pocket.."

i think

a. “When all was ready, the man reached in his pocket for a second piece of birch bark.

Explanation:

people are gonna need the passage.