When Ophelia Was 10 Years Old, She Completed the Original

When Ophelia was 10 years old, she completed the original Stanford-Binet Intelligence Scale.She answered all the questions that a typical 5- or 6-year-old would answer, but none of the questions a typical 7- or 8-year-old would answer.Based on this information, what is Ophelia's mental age?

A) 5
B) 6
C) 8
D) 10