Which of the following statements is true regarding a movement along a demand curve?a) It describes the relationship between quantity sold and price, assuming other factors are constant.b) It helps determine the marginal revenue a company has to achieve in order to be profitable.c) It takes into consideration variation in all the demand factors when plotting the demand curve.d) It implies the profits of a company have improved significantly.e) It is unaffected by changes in consumer tastes and their income.

A movement along the demand curve means that other things being constant there is a change in quantity demanded due to change in the price. An upward movement shows a decrease in quantity demanded due to an increase in price while a downward movement shows an increase in the quantity demanded due to a decrease in the price.

Other factors such as the income of the consumer, population, price of substitutes and complements, tastes and preferences of the consumer etc are assumed to be constant.