Final answer:
Achilles begrudgingly agrees to the instructions from Thetis to give up Hector's body and to find solace in nourishment and rest.
Therefore, the correct answer is: option b). He begrudgingly agrees to the conditions.
Step-by-step explanation:
When Thetis, complying with Zeus, tells Achilles he must give up Hector's body, eat, sleep, and lie with a woman, Achilles begrudgingly agrees to the conditions.
Achilles' reaction to his mother's words is not of rage or vengeance, but rather of compliance, though he does so reluctantly and with a sense of obligation rather than enthusiasm.
The emotional turmoil Achilles experiences stems from his grief and anger over the death of Patroclus and his focus on vengeance against Hector, which makes these instructions feel secondary.
Therefore, the best answer to the question is that he begrudgingly agrees to the conditions, which corresponds to option b) He begrudgingly agrees to the conditions.