Suppose a Researcher Constructs a Six-Item Index for Measuring Risk-Taking

Suppose a researcher constructs a six-item index for measuring risk-taking propensity. Evidence that eighth graders who score high on the index are more likely to engage in risky behaviors (e.g., initiate sexual activity, use drugs) supports the index's

A) test-retest reliability.
B) internal consistency.
C) intercoder reliability.
D) convergent validity.