【单选题】Human intelligence and the IQ scales used to measure it once again are becoming the focus of fiery debate. As argument rages over declining test scores in the nation's schools, an old but explosive is...
A.
the newly found racial pattern underlying students' performance.
B.
the worsening students' performance in their studies.
C.
the long-standing division in the definition of intelligence.
D.
the dubious IQ scales used to measure intelligence.