A male child of 15 years with a mental age of 9 years has an IQ of:

**Core Concept**
The question is testing the understanding of the Intelligence Quotient (IQ) formula, which is a measure of cognitive abilities. The formula is: IQ = (Mental Age / Chronological Age) x 100. This formula is used to calculate the IQ of an individual.

**Why the Correct Answer is Right**
To calculate the IQ of the child, we need to divide the mental age by the chronological age and multiply by 100. In this case, the mental age is 9 years and the chronological age is 15 years. IQ = (9 / 15) x 100 = 60. This means the child has an IQ of 60, which is below the average IQ of 100.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not follow the correct formula for calculating IQ.
* **Option B:** This option is incorrect because it does not provide a valid calculation for IQ.
* **Option C:** This option is incorrect because it does not provide a valid calculation for IQ.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that IQ scores are not always a perfect measure of intelligence, and they can be influenced by various factors such as cultural background and education. However, the IQ formula is a useful tool for comparing cognitive abilities among individuals.

**Correct Answer:** C. 60