Which of the following is an illuminated object

The lightbulb, the fire, and the Sun all create light from some energy source.

The Moon doesn't create light. The parts of it that the Sun shines on

are visible, the parts of it that the Sun doesn't shine on are not visible.

Just like a rock on the ground at night, the Moon must be illuminated

by a flashlight in order to be seen. The Sun is the flashlight.