Answer:
b. pay attention to the speaker.
Step-by-step explanation:
The answer is that if Cambria decided to turn her cell phone off, her decision will help her pay attention to the speaker because if the cell phone is on, it can be a distraction because she might receive a call or a message that would divert her attention from what the speaker is saying. The other options are not right because not having an electronic device won't make her prejudge the speaker or jump into conclusions. Also, having the cellphone off won't allow her to do a research about the topic.