The Conclusion That Mathematics Talent Is Biological, Based on Studies

The conclusion that mathematics talent is biological, based on studies of mathematically gifted students,

A) is unwarranted because researchers collected no biological data.
B) is unwarranted because researchers found such small gender-related differences that their conclusions were invalid.
C) indicates their high heritability quotients from parents and first-degree relatives.
D) provides the best available evidence that quantitative abilities are biological because the home environment of the children showed no differences in encouragement for girls and boys.