## Core Concept
Normal Intelligence Quotient (IQ) is a measure of human intelligence that is calculated through standardized tests. It is used to assess cognitive abilities relative to a person's age group. The average IQ score is set at 100, with a standard deviation of 15.

## Why the Correct Answer is Right
The correct answer, , indicates that a normal or average IQ ranges from 85 to 115. This range is considered to represent the normal or average intelligence in the population. Scores within this range suggest that an individual's cognitive abilities are in line with what is expected for their age group. The classification of IQ scores is generally as follows:
- Average or Normal Intelligence: 85-115
- Above Average or Bright Normal: 116-130
- Gifted: 131-145
- Highly Gifted: 146-160
- Profoundly Gifted: 161 and above
- Borderline Intellectual Functioning: 71-84
- Extremely Low (Intellectual Disability): 40-54

## Why Each Wrong Option is Incorrect
**Option A:**
This option is incorrect because it suggests a range (0-84) that is generally considered to be below average or even indicative of intellectual disability, depending on the specific scores.

**Option B:**
This option suggests a range (116-130) that is considered above average or bright normal, not within the normal or average range.

**Option D:**
This option (131 and above) refers to gifted and highly gifted ranges, which are well above the normal IQ range.

## Clinical Pearl / High-Yield Fact
A key point to remember is that IQ scores are not the sole determinant of a person's potential or intelligence. Factors such as creativity, emotional intelligence, and socio-economic status also play significant roles. Additionally, IQ scores can be influenced by various factors including education, nutrition, and access to cognitive stimulation.

**Correct Answer:** . 85-115