Read the following informational paragraph.
Some people find it difficult to study in today's era of electronic and social distractions. One study aid that is available through smartphone technologies that has been clinically proven to help limit distractions is a type of sound program called binaural beats. The word binaural comes from "bi," meaning two, and "aura," meaning sound. The sounds that play use different frequencies in each ear. Different frequencies have been shown to have different effects. Some binaural beat soundtracks have been shown to help relax people, so they can sleep more deeply, while other binaural beat soundtracks have been shown to help with focus and concentration. Many people around the world have a deep emotional or spiritual connection to different types of music, and this is expressed in many ways. Several sound engineers have made binaural beat programs that use soothing music on top of the altered-frequency sounds that create the effects. Many teachers will play binaural soundtracks from their computer or smartphone in class to help their students stay calm and focused throughout the class period. If students could use some of these programs at home during their study time, they may be surprised to find a marked improvement in their overall performance.
Which of the following sentences should be deleted because it includes details that are NOT important to the main focus of the paragraph?
a
Many teachers will play binaural soundtracks from their computer or smartphone in class to help their students stay calm and focused throughout the class period.
b
Many people around the world have a deep emotional or spiritual connection to different types of music, and this is expressed in many ways.
c
If students could use some of these programs at home during their study time, they may be surprised to find a marked improvement in their overall performance.
d
One study aid that is available through smartphone technologies that has been clinically proven to help limit distractions is a type of sound program called binaural beats.
b
Many people around the world have a deep emotional or spiritual connection to different types of music, and this is expressed in many ways.