Two years ago sean took an intelligence test and earned a score of 99. recently he took the same test and earned a score of 102. yet at school sean earns straight-a grades, and his teachers consider him to be an outstanding student. given what you've learned about intelligence tests and iq scores, choose the most likely explanation for the apparent discrepancy between sean's iq score and school performance.
a. sean probably gets support for academic achievement from family and friends and is motivated to do well at school.
b. school grades are notoriously poor measures of school achievement; sean's iq scores are better indicators of what he has learned at school.
c. sean must have been feeling poorly both times that he took the test, because iq scores are generally very accurate predictors of children's school grades.
d. intelligence tests and school grades measure such different abilities that the discrepancy does not require any explanation.