To get the intelligence quotient (I.Q.) of the individual, the formula will be

A. $${\text{I}}{\text{.Q}}{\text{.}} = \frac{{{\text{Chronological Age}}}}{{{\text{Mental Age}}}} \times 100$$

B. $${\text{I}}{\text{.Q}}{\text{.}} = \frac{{{\text{Mental Age}}}}{{{\text{Chronological Age}}}} \times 100$$

C. $${\text{I}}{\text{.Q}}{\text{.}} = \frac{{{\text{Chronological Age}}}}{{{\text{Mental Age}}}} \times 500$$

D. $${\text{I}}{\text{.Q}}{\text{.}} = \frac{{{\text{Mental Age}}}}{{{\text{Chronological Age}}}} \times 100$$

Answer: Option B