What is a planet’s period of rotation?
A.
the shape of its orbit
B.
its tilt relative to the sun
C.
one complete spin on its axis
D.
one complete orbit around the sun

The answer is the letter "C" ( I have honors science I am good at this type of stuff ) Hope I helped :) ( ask me for help when u need it :)

one complete spin on its axis C:Note: although it's usually a single number for planets, on places like the sun where some parts turn quicker than others, different parts have different rotation periods.