Final Answer:
The scenarios that shift the demand curve for pumpkins are:
A) Television ads promoting pumpkin-flavored coffee drinks.
C) Several new coffee shops, serving pumpkin-flavored coffee drinks, open in Rio Rico.
D) Halloween.
E) Renowned experts state that pumpkins increase happiness.
Step-by-step explanation:
A) Television ads promoting pumpkin-flavored coffee drinks: This scenario increases the demand for pumpkins as it creates awareness and interest in pumpkin-flavored products, potentially leading to higher pumpkin consumption.
C) Several new coffee shops, serving pumpkin-flavored coffee drinks, open in Rio Rico: The opening of new coffee shops offering pumpkin-flavored drinks in a specific location (Rio Rico) can drive up the demand for pumpkins in that area due to increased accessibility and exposure.
D) Halloween: Halloween is a significant event associated with pumpkin consumption, as pumpkins are commonly used for carving Jack-o'-lanterns and other decorations during this season, leading to a surge in demand.
E) Renowned experts state that pumpkins increase happiness: Positive endorsements from experts can influence consumer perceptions and preferences, potentially leading to an increased demand for pumpkins as consumers associate them with happiness.
The other scenarios (B and F) relate to factors that may affect the supply of pumpkins rather than directly influencing consumer demand.