In his 1969 monograph,"How Much Can We Boost IQ and Scholastic Achievement?" Arthur Jensen claimed that

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Jensen's main argument was that individual, ethnic, and socioeconomic status (SES) variations in intelligence can be largely traced back to genetic factors, rather than environmental or cultural factors. He further hypothesized that these genetic differences were responsible for the so-called "achievement gap" between different racial and ethnic groups. Hence, option A is the closest to Jensen's position.

In His 1969 Monograph,"How Much Can We Boost IQ and Scholastic