The sentence that contains context clues to help a reader 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.
The context clue here is "despite her fear of an audience," which implies that Abigail is showing a sense of reluctance or timidity, helping a reader infer that "meekly" relates to being shy or submissive.