Reduce the power dissipation in the feedline to the antenna
Increase power transfer from the transmitter to the feed line✓Bonne réponse
All these choices are correct
Explication
An antenna tuner is a matching network at the transmitter end that transforms whatever impedance the feed line presents into the impedance the transmitter is designed to drive, so the transmitter delivers full power instead of folding back. It does not change conditions on the far side of itself: the mismatch ratio on the line between tuner and antenna is unchanged, which is why the combined answer is wrong.