Greatest Elongation in a Planetary Orbit Occurs When the Angle

Multiple Choice

Greatest elongation in a planetary orbit occurs when the angle from the

A) Earth to the planet and then to the Sun has its greatest possible value.
B) the Sun to Earth and then to the planet is 90°.
C) Earth to the Sun and then to the planet is 90°.
D) Sun to the planet and then to Earth is 90°.