Institutional elements of tourism supply include:Select one:a.Car rental companiesb.Theme parksc.Hotel chainsd.Tourist Information Centres

All of the options listed (a. Car rental companies, b. Theme parks, c. Hotel chains, d. Tourist Information Centres) can be considered as institutional elements of tourism supply. These are all organizations or establishments that provide services or products that cater to the needs of tourists.

a. Car rental companies: These companies provide vehicles for rent by tourists who need to travel around the destination. This is a crucial part of the tourism supply chain, especially in destinations where public transportation is not easily accessible.

b. Theme parks: These are large-scale entertainment complexes that include a variety of activities such as rides, games, shows, and other attractions. They are a major draw for tourists, especially families with children.

c. Hotel chains: These are companies that own or manage a series of hotels. They provide accommodation for tourists, which is a fundamental need for any traveler.

d. Tourist Information Centres: These centres provide information about the destination, including attractions, accommodations, transportation, and other services. They help tourists plan their trip and navigate the destination.

Therefore, all of the above are institutional elements of tourism supply.