What does this interaction between Bilbo aans Thoron reveal about Bilbo? A. Bilbo believes the dwarves can handle the dragon on their own
B. Bilbo wants to help plan the expedition
C. Bilbo knows the castle and dragon well
D. Bilbo was having second thoughts about participating in the expedition

It's D, he's having second thoughts about the expedition.

Explanation:

You can tell he's no longer entirely sure and is a bit hesitant about the whole plan.

cassius, casca, and their allies plant false documents to manipulate brutus to join their cause to remove caesar. after doing so, they visit brutus at night in his home to persuade him of their views. there they plan caesar's death. brutus is troubled but refuses to confide in his devoted wife, portia. on 15 march, caesar's wife, calpurnia, urges him not to go to the senate. she has had visionary dreams and fears the portents of the overnight storms.

tending to cause harm