Answer:
D. To demonstrate his or her strengths to college admissions boards.
Explanation:
SAT is required as an admission requirement in colleges. Although subject tests are not for admissions in colleges but students still take them to check their subject eligibility and monitor their strengths and weaknesses. Sometimes students send these tests in the admission applications to strengthen their case by show casing their strengths.
Therefore option D. To demonstrate his or her strengths to college admissions boards is the correct answer.