The question asks about the typical behavior of an individual's Intelligent Quotient (IQ) score, assuming all other conditions are normal.

Understanding IQ Score Stability

Intelligent Quotient (IQ) is a score obtained from standardized tests designed to assess a person's cognitive abilities or intelligence, relative to an average or baseline. It's a way to measure various mental capabilities, such as reasoning, problem-solving, and memory.

Explaining IQ Constancy

Based on extensive research in psychology and psychometrics, an individual's IQ score is generally considered to be relatively stable throughout their adult life. While minor fluctuations can occur due to factors like:

• Testing environment
• Motivation levels during the test
• Specific learning experiences
• Health status

These variations are typically small, and the overall score tends to remain largely consistent. This stability suggests that the core cognitive abilities measured by IQ tests are quite enduring once an individual reaches adulthood.

Addressing IQ Score Variability

Let's consider why the other options are less accurate:

• Always keeps changing / Fluctuates all times: This implies significant and constant instability, which is not characteristic of IQ scores in adults under normal conditions. While IQ can develop during childhood and adolescence, it tends to stabilize later.
• Keeps increasing: While learning and gaining knowledge can improve specific skills, IQ scores do not typically show a continuous upward trend throughout adulthood. Significant increases usually require substantial changes in environment or cognitive training, and even then, the underlying capacity measured by IQ is relatively fixed.

Therefore, the most accepted view is that an individual's IQ score almost remains constant when other conditions are normal.