What would be the effect of the following changes on the market price of a company's stock,

Question:

What would be the effect of the following changes on the market price of a company's stock, all other things the same?
a. Investors demand a higher required rate of return for in general.
b. The covariance between the company's rate of return and that for the market decreases.
c. The standard deviation of the probability of rates of return for the company's stock increases.
d. Market expectations of the growth of future earnings (and dividends) of the company are revised downward.
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