Answer:
The following passage (paragraph 7) adds to the development of the narrative mainly by:
A. suggesting how desirable the apple is to Tom when Ben eventually offers it.
Step-by-step explanation:
In "The Adventures of Tom Sawyer," while Tom is whitewashing the fence, Ben is nibbling an apple. When Ben offers Tom the apple, his mouth waters. This expression is used when something is appealing to us because it looks or smells delicious, or simply because we are hungry. Clearly, Tom would love to eat the apple if his mouth is watering because of it. However, he "stuck to his work," controlling his desire.