General exam question G7C03

WhyAn impedance matching transformer at a transmitter output presents the desired impedance to the transmitter and feed line. An impedance matching transformer at a transmitter's output reshapes whatever impedance the antenna system actually presents into the impedance the transmitter and feed line expect to see, so power transfers efficiently instead of reflecting back, answer B. It isn't there to minimize power output, has nothing to do with power supply ripple, and it doesn't minimize radiation resistance, that's a property of the antenna itself, not something a matching transformer sets out to reduce.