The confidence index indicates a strong stock market when the

A) ratio of the average yield on high-grade corporate bonds to the average yield on low-grade corporate bonds rises.

B) ratio between the average yield on S&P 500 stocks to the average yield on high-grade corporate bonds rises.

C) consumer confidence index rises above its long-term trend.

D) demand for bonds declines relative to the demand for equity securities.

Explain your answer(s)