Consider this scenario. -in recent years many americans have started to pay more attention to the amount of sugar and calories in their diet. -some soft drink companies are concerned about consumers' desire to be healthier. -they believe that this could result in a drop in demand for their products. which factor affecting demand does this scenario illustrate? a. a change in the number of people in the population b. a change in the price of a substitute good from a rival soft drink company c. a change in consumer tastes and preferences d. a change in the price of a complementary good from a potato chip company