The ages of three contestants in the Cayley Contest are 15 years, 9 months; 16 years, 1 month; and 15 years, 8 months. Their average (mean) age is
Answer Choices
A. 15 years, 8 months
B. 15 years, 9 months
C. 15 years, 10 months
D. 15 years, 11 months
E. 16 years