Colin cherry's experiment in which participants listened to two different messages, one presented to each ear, found that peoplea. could focus on a message only if they are repeating it. b. could focus on a message only if they rehearsed it. c. could focus on one message and ignore the other one at the same time. d. could not focus on a message presented to only one ear.

C). Could focus on one message and ignore the other one at the same time.

Explanation:

As per the given situation, Colin Cherry's experiment reveals the cognitive process of attention that allows an individual to selectively focus on a distinct stimulus while avoiding or ignoring the other apparent stimulant at the same time. His experiment reveals through 'attention' a person is able to focus one message by designating his/her limited processing ability to that only and ignoring the other perceivable message at the same time in order to concentrate and understand that particular message more effectively. Thus, option C is the correct answer.

the mending wall was written by robert frost