Melita Oden compared the 100 most successful men (the A group) with the 100 least successful men (the C group) from Lewis Terman's original sample of 1,500 children with genius-level intelligence. Given that the IQ scores of the A and C groups were essentially the same, what accounted for the difference in their level of accomplishment? Group of answer choices Birth-order differences: As were more likely to be only children or firstborns than Cs. Socioeconomic status: As came from families that were wealthier and better educated than the Cs' families. Creativity and flexibility: Cs were less creative and flexible than the As. Personality factors: As were more goal-oriented, more likely to persevere, and had a greater desire to excel than the Cs.

The personality or intrinsic factor of affectivity within the same individual is psychological variables that may relate in any way to something like the progress of language acquisition.
These variables impact success more than just IQ, including being goal-oriented, significantly larger ability to succeed, etc.

All other options offered are not relevant to either the circumstance in question. So, the best one is the one above.