Companies that are go-betweens that link suppliers with the traveling public are called

They are called intermediaries.

Explanation:

An intermediary company is one that impairs the communication between two trading factors. The goal is to facilitate and expedite the process of negotiating, buying and selling a particular product or service. In general we can say that the intermediary companies establish communication between the producer or supplier and the customer, trying to adapt the guidelines of each other and thus establishing a good business.

answer; /// i believe that the correct answer is (a) administrative team;