The major reason why researching the average earnings by major and by career be useful to you as you choose an institute for higher education is:
This is the sum total of the aggregate income which a person can expect to be paid as it takes into account the different earnings of people in the same field
For a student who is making research on the average earnings to help him make a choice on the career choice. We should note that the career choice was not mentioned, but the institution of learning and this would make option B the most likely answer.
Therefore, the correct answer is option B
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