A. 4 years, 4 months, and 4 days
B. 5 years, 5 months, and 5 days
C. 6 years, 6 months, and 6 days
D. None of these

The correct answer to the question: “Which of the following was the customary age of the children for starting Maktab education_______________________?” is “4 years, 4 months, and 4 days”.