The Synodic Period of a Planet Is the Time Between

The synodic period of a planet is the time between:

A) successive alignments of the Sun, the planet, and Earth (e.g., time between successive oppositions) .
B) successive alignments of the Sun, the planet, and a particular point on the sky (e.g., a star) .
C) its passage from conjunction to opposition in its orbit.
D) successive passages of the planet across the celestial equator.