The rate at which a stock's price is expected to appreciate (or depreciate) is called the yield.

Capital gains yield                        

Explanation:

Generally, a capital gains refer to the profit made from selling a capital asset like bond, real estate or stock when the selling price is greater than the price at which the asset was purchased.

Specifically, capital gains yield can be then be described as the appreciation (depreciation) of the price of an investment expressed in percentage terms.

Capital gains yield can be calculated as the difference between the selling price and purchase price of an investment divided by its purchase price and the result is multiplied by 100. This can be mathematically expressed as follows:

Capital gains yield = [(Investment selling price - Investment purchase price) / Investment purchase price] * 100

Therefore, the rate at which a stock's price is expected to appreciate (or depreciate) is called the Capital gains yield.

and whats your questoin

answer; tech (a) is correct;