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【单选题】
某大学的一位研究人员希望估计该大学本科生平均每月的生活费支出，为此，他调查了该大学200名本科生，发现他们每月平均生活费支出是500元。该研究人员感兴趣，的样本指标是( )。A.
该大学的所有本科生人数
B.
该大学所有本科生月平均生活费支出
C.
该大学所有本科生的月生活费支出
D.
所调查的200名本科生的平均月生活费支出
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