What Was One Result of Robert Rosenthal's Experiments on Students

What was one result of Robert Rosenthal's experiments on students in a San Francisco elementary school?

A) Students tended to perform better when teachers had higher expectations of them.
B) Students expected to perform better continued excelling throughout their academic lives.
C) Wealthy students almost always outperformed students from families in poverty.
D) Struggling students received more attention from teachers, and they improved faster.