With no explanation, chose the best option from "A" or "B". Carrie is walking down a busy city street where people are working in manholes while listening to music on her earbuds. Carrie wants enjoy her music.

A: Carrie makes sure to just use one earbud, so she can still hear what is going on around her in the busy city which can be dangerous.
B: Carrie activates the noise cancelling feature on her earbuds and ignores strangers that are waving at her, so she can focus on listening to her music.
A.