Question

1) What describes the unusually large release of plasma from the sun's corona?

Answer 1

1) The correct answer is CME:
In fact, CME stands for "Coronal Mass Ejection", and they are huge release of plasma and magnetic field from the corona of the Sun.

2) The only statement that could be true is "X and Y are both within the solar system."
In fact, the distance between X and Y is 30.2 AU (1 AU is the distance between Earth and Sun). Pluto, the farthest planet from the Sun, is located at approximately 40 AU from the Sun:  the distance between X and Y is smaller than this value, so they could be both in the solar system.