The average age of 30 students of a class is 14 years 4 months. After admission of 5 new students in the class the average becomes 13 years 9 months. The youngest one of the five new students is 9 years 11 months old. The average age of the remaining 4 new students is

• A. 11 years 2 months
• B. 13 years 6 months
• C. 12 years 4 months
• D. 10 years 4 months