Answer:
I too believe the best option to be letter a) She just couldn't stand another minute of the incessant howling.
Step-by-step explanation:
At a quick glance, all options seem to fit the situation and to close the paragraph well. All of them relate to how Olivia feels about the band. However, the language throughout the paragraph describing Olivia's emotions and opinion is intense. Olivia doesn't simply dislike the singing; she absolutely hates it. It sounds like a person (howling) in pain or a dog (howling) lost in the woods! If she feels as if her eardrums are about to burst, that means she can't stand it anymore. Thus, to keep the language in the conclusion sentence cohesive with the rest of the paragraph, the best option is indeed letter a.