When Lance Was 8 Years Old,he Completed the Original Stanford-Binet

Multiple Choice

When Lance was 8 years old,he completed the original Stanford-Binet Intelligence Scale.He answered all the questions that a typical 10-year-old would answer,but none of the questions a typical 11-year-old would answer.What is Lance's mental age based on this information

A)  8 years 
B)  9 years 
C)  10 years 
D)  18 years