The project approach heading within the Project Brief should focus on how the project will be conducted or managed. The statement 'The Project Manager will be responsible for ensuring that the agreed project approach remains an appropriate choice' is the most relevant as it describes a responsibility centered on managing and overseeing the chosen approach. Option A refers to an initiation stage activity, option B addresses supplier management which is not specific to project approach, and option C describes an outsourcing decision that does not fit under the general scope of the project approach.