Sadiq and Tahir had an excellent time-travel adventure back to 1916. In order to come back to present sadiq (who is a little below average in intelligence needs a score of 115 on the stanford-Binet Intelligence Test, Sadiq has to convince Professor Tahir that he is_than he actually is, because the Stanford-Binet IQ was calculated as__.

A. older; (mental age/chronological age 10
B. younger; (mental age/chronological age 100
C. older; (chronological age/mental age 10
D. younger; (chronological age/mental age 10