The correct information is C) They both make reservations and provide information for tourists.
The tasks that travel agents and hotel concierges have in common are "They both make reservations and provide information for tourists."
Travel agencies provide a gamut of services to tourists and travelers that benefit them in the selection of airlanes, hotels, car reservation vacation packages, tickets for concerts or sports events, or any recreational activity in the area they are visiting. Travel agencies charge you for their services but these agencies have the experience and contacts to make your trip, a great experience for you and your family.
Hotel concierges do similar things once you are in the location. They do not charge you anything because the service is provided by the hotel. Concierges give you touristic information, make a reservation to shows or restaurants, and any recommendation that helps you enjoy your visit.