Answer:
a, a movement along a demand curve
b. shift of the demand curve.
c. a movement along a demand curve
d. shift of the demand curve.
Explanation:
Only a change in the price of a good leads to a movement along the demand curve of that good. Also, only a change in the price of the good would lead to an increase or decrease in the quantity demanded of that good.
Other factors other than the change in the price of the good would lead to a shift of the demand curve. Some of those factors include :
1. a change in consumers' expectation
2. a change in the taste of consumers
3. a change in income
a. A discount would reduce the price of furniture, as a result the quantity demanded would increase. There would be a movement down along the demand curve.
b. As a result of the increase in grant, the income of students increase. this would lead to an increase in demand. the demand curve would shift outward
c. As a result of higher prices, the quantity demanded of detergents would reduce. This would lead to a movement up along the demand curve for detergents
d. An increase in demand for energy drinks is as a result of a change in taste. this would lead to an outward shift of the demand curve