The sentence that contains context clues to help determine the meaning of the italicized word "meekly" is:
"Abigail meekly waited to sign up for the talent show in her community, despite her fear of an audience."
In this sentence, the context clue "despite her fear of an audience" suggests that "meekly" refers to Abigail's timid or shy behavior in the face of her fear, indicating a lack of confidence or assertiveness.