The repetition of "there will be time" annotates the sense that Prufrock is unsure of his intents. It raises the thought that he hasn't convinced himself or his partner. To "prepare a face" sends a message that Prufrock must hide his true emotions from his lover.The effect of repetition in the poem is to help the reader know that the repeated part is important and they should remember it. It contributes to tone by the repetition because it shows the theme represented in the text.
Assuming this is referring to the same set of selections that was posted before, the proper answer is the line that as to do with the "coming of the dawn".
Lightheartedness means cheerful, carefree ect.
This means the line "The sounds of water splashing and laughter echoed in the distance; Tim's friend's had gone for a late-night swim." is the phrase that is the correct answer, since it talks about the happy actions of Tim's friends.
Answer C.