What Causes Synchronous Rotation

Multiple Choice

What causes synchronous rotation?

A) Most jovian moons were formed out of their planet's nebula with the same rotational period as their parent planet.
B) Most jovian moons were formed out of their planet's nebula with the same orbital period.
C) A massive planet exerts a tidal force on a moon that causes the moon to obtain the same rotational period as its parent planet.
D) A massive planet exerts a tidal force on a moon that causes the moon to align itself such that its tidal bulges always point toward and away from the planet.
E) orbital resonances with other moons