Answer:
C. stock indexes are unbiased and perfect indicators of market activity.
Step-by-step explanation:
Stock indexes are a tool that is used to track a group of assets using standardised criteria.
Usually indexes monitors a group of securities. Indexes can be broad based or specialised.
Indexes are statistically derived benchmarks that securities are measured against. They are however not unbiased and perfect indicators of market activity.
This is because investor behaviour cannot be guaged statistically.
However indexes replicate the market activity in a certain segment of the stock market, serve as a benchmark to evaluate investment manager performance, and are based on criteria that define the market segment of interest.