According to Your Textbook, Existing Empirical Studies Lead to the Conclusion

According to your textbook, existing empirical studies lead to the conclusion that

A) African Americans actually possess physical traits superior to those of whites.
B) physical differences probably do account for differences in sport performances between blacks and whites.
C) African Americans' personalities allow them to adapt to sports better than whites.
D) we do not know whether African Americans actually possess physical traits that account for differences in sport performances between blacks and whites.