How Does the Academic Achievement of Homeschooled Students Compare to That

How does the academic achievement of homeschooled students compare to that of public school students?

A) Homeschooled students perform better in reading, but worse in math and science.
B) Homeschooled students perform significantly better, on average, than public school students.
C) No one knows, because there is no way to test homeschooled students.
D) Homeschooled students do well only if their parents are certified as teachers; otherwise, they do fairly poorly.