If wired networking works but wireless connectivity repeatedly drops, which check is most useful?

Correct answer: Check the wireless adapter, signal strength and driver

The governing concept is fault isolation: because wired networking works, the router’s general internet service and much of the network path are probably available. Attention should therefore move to the wireless adapter, weak signal, interference, incorrect wireless settings, or an outdated driver. Option B is correct because it checks the components specific to wireless communication; an optical drive, printer cartridge, and monitor brightness cannot normally cause repeated Wi-Fi drops.