Select the sentence with the appropriate use of preposition.

They rise with the morning lark and labour till almost dark.

The sentence with the appropriate use of preposition is They rise with the morning lark and labour till almost dark.

The preposition "till" is used to indicate a point in time up to which something continues. In this case, the speaker is saying that the people work up to the point in time when it is almost dark.

The other prepositions in the options are not appropriate for this sentence. The preposition "utmost" is used to indicate the highest or greatest degree of something. The preposition "by" is used to indicate a point in time by which something is completed. The preposition "still" is used to indicate that something continues to exist or happen.