Answer: B) to be in a state of restrained excitement or anger
Explanation: The word "simmer" in sentence 2 best means to be in a state of restrained excitement or anger. In cooking "simmer" means to bubble just below the boiling point. So people use the word "simmer" metaphorically to describe a person in a state of inaction but unhappily or happily desiring to reach a state of action or decision.
