On a dichotic listening task, A. people can accurately monitor two tasks at the same time, except when the tasks are both auditory. B. people notice little about the message that they are supposed to ignore. C. experts tend to process the message that they are supposed to ignore, but novices don't process an irrelevant message. D. people can accurately monitor two tasks at the same time.

B. people notice little about the message that they are supposed to ignore

Explanation:

In dichotic listening task people are able to concentrate on one voice while ignoring the other. It is observed that during dichotic listening task people concentrate more on one task than other. Sometimes dichotic listening task is used to examine the selective attention of brain. In the test the person is subjected to two voices simultaneously over the headphones and asked to pay attention either one or both voices. Then he is aked questions about the content.

Example; If you are talking on the phone with someone in a room  filled with voices of other people, you would be able to listen and concentrate at the voice on the phone while ignoring the other voices because of dichotic listening.

Example; If you are attending a seminar of a psychology professor and some peoples are talking in the hall you would be able to concentrate on the voice of the professor because of dichotic listening.