Answer:
The researcher is trying to demonstrate a scientific experiment called <u><em>Dichotic Listening</em></u>
Explanation:
<em>Dichotic listening</em> is the listening to different acoustic events presented to each ear simultaneously. Most commonly, <em>the acoustic signals are speech, such as digits, words, consonant-vowels, or sentences.</em>
This test is used to carry out behavoural test of <em>Central auditory processing</em> which help to determine which ear (left ear or right ear ) has the <em>best advantage in listening</em>.
The correct pronoun is their.
Every contestant should wear their best suit on Tuesday.
Their is a personal pronoun that means belonging to or associated with the people or things previously mentioned or easily identified. Therefore the suits belongs to the contestants, there is more than one contestant, we don't know if they are male or female and 'it' refers to objects not people so the correct pronoun is their.
It was Madonna if I’m incorrect I’m am super sorry
Dams use hydroelectricity to power towns and cities, so I would go with B) provide power