A) A consumer changes their demand for a good based on a change in the price of a substitute.
B) A consumer substitutes one good for another in response to a price change, holding real income constant.
C) The price of a good changes, leading to an increase in total income.
D) A change in income results in a change in demand for normal goods.
For Explanation Click Here:
The substitution effect occurs when the price of a good changes, causing consumers to substitute that good with a cheaper alternative, assuming income remains constant. This effect causes the quantity demanded of the original good to change.