Question

which of the following components is most likely to use a molex power connector?
case fan or older hard disk drive (hdd)
sata ssd
monitor
usb external hard drive

Explanation:

Molex power connectors are commonly used to supply power to case fans and older hard disk drives (HDDs). SATA SSDs use SATA power connectors, monitors typically use power cables with standard AC connectors (or other specific connectors for their power needs), and USB external hard drives get power via the USB connection (or an external power adapter in some cases but not Molex). So the component most likely to use a Molex power connector is a case fan or older HDD.

Answer:

A. Case fan or older hard disk drive (HDD)