Dependent on the observer and based on feelings, opinions and general impression; it cannot be easily measured, so is not always reliable.

• A. Stereotyping
• B. Subjective data
• C. Training plateaus
• D. Vectors

Answer: (B)

Subjective data refers to information that comes from the observer's feelings, opinions and general impression. Because it depends on personal judgment, it isn’t easy to measure precisely and results can vary between observers, making it less reliable. An example is a rating of perceived exertion during exercise. This contrasts with objective data, which is measured with standard tools and yields consistent results. The other terms don’t fit the idea here: stereotyping is a biased belief about people, training plateaus describe a stage in performance development, and vectors are mathematical quantities with direction and magnitude.