Which signal should be used to send the group "Bearing 074 degrees True"?

The signal "A074" is the correct representation for communicating the group "Bearing 074 degrees True." In maritime communication, the letter "A" is specifically used to denote that the following number indicates true bearing. This convention is important as it helps avoid misunderstandings during navigation and ensures clarity in communication between vessels.

The use of "A" before the bearing value indicates that the direction is given relative to true north, which is critical information for navigators. Each of the other choices starts with a different letter, which does not correspond to the designation for true bearings, leading to confusion if used in practical situations. Therefore, the designation of "A074" clearly communicates the bearing in a standardized format that is recognized in navigation and signaling protocols.