Answer:
D. Less and less of the moon.
Step-by-step explanation:
Waning has the meaning decreasing. A waning moon is the moon that decreases in size and its illumination . Moon starts waning a day after the full moon. Its size keeps decreasing and ultimately it is not visible on the new moon day .
A day after the new moon, it starts increasing in size and brightness and is slowly visible each night, until it is completely shining on the full moon day again. This is the waxing of the moon, where its size keeps increasing.