Final answer:
Architects involved in competitive bidding are responsible for preparing bidding documents, issuing addenda for clarifications or amendments, and conducting site visits for contractors' better understanding of the project.
Step-by-step explanation:
The responsibilities of an architect during the competitive bidding process mainly involve preparation and clarification tasks rather than selection and management. Architects are responsible for creating comprehensive bidding documents, which include detailed drawings, specifications, and conditions of the contract.
When questions arise, architects have to issue addenda to clarify or amend the bidding documents. Additionally, architects often conduct pre-bid site visits to help potential contractors better understand the project and its requirements.
The options given in the question outline different roles in a construction project. In this context, the architect's responsibilities are most accurately described as preparing bidding documents, issuing addenda, and conducting site visits (option c).