Why are short, heavy-gauge wires used for a transceiver's DC power connection?

Answer: A. To minimize voltage drop when transmitting

A transmitting radio draws a lot of current, and thin or long wires have more resistance. That resistance causes voltage drop, so the radio gets less voltage than the supply provides. Short, heavy-gauge wires are used to minimize voltage drop when transmitting.

Tip: Thick and short = low resistance = little voltage drop.