Answer:
Success??
The noun peak can refer to something that is a literal highpoint, like that snow-covered peak over there in the distance, but you will also hear it used to refer to more abstract high points, such as a time of greatest success
I believe that this would be A
The term that tells us the increasing display of the lighted portion of the moon is the "waning phase." The waning phase of the moon is the opposite of the waxing phase. It is the phase wherein the illuminated region of the moon, as seen on Earth, gets growing and expanding from a new moon to the full moon.