Your Text Argues That Test Bias Is at Best a Minor

Your text argues that test bias is at best a minor contributor to racial differences in IQ scores. This conclusion is supported by the fact that:

A) Group differences are found not only on tests of verbal intelligence, but also on tests of spatial intelligence.
B) Group differences are found not only on tests of spatial intelligence, but also on tests of verbal intelligence.
C) Group differences are found neither on tests of verbal intelligence nor on tests of spatial intelligence.
D) Group differences are found on tests of verbal intelligence, but not on tests of spatial intelligence.