Final answer:
To communicate with ATC using COM 2, set the audio panel to select COM 2 for both transmit and receive. This aligns your transmission and reception on the same channel, enabling clear two-way communication.
Step-by-step explanation:
If you want to transmit to ATC on COM 2 and receive over a headset, you would set the audio panel to select COM 2 for both transmit and receive. This is because in aircraft communication systems, the pilot must select the same channel to both transmit and receive to maintain proper communication with a single source, which in this case is the Air Traffic Controller (ATC). Therefore, the correct setting would be option A) Select COM 2 for transmit and receive. This ensures that you are both sending out your voice to ATC through COM 2 and also listening to responses through COM 2 on your headset.