Which of the following is not a prediction of General Relativity? (A) gravitational waves (B) spacetime is distorted by mass and energy (C) light can be bent and shifted in frequency by gravity (D) planetary orbits are elliptical

Answer: planetary orbits are elliptical

The fact that planetary planetary orbits are elliptical was told by Kepler in the first Law of Planetary motion that states:

The orbit of a planet around the Sun, is in the form of an ellipse with the Sun at one of the two foci of that ellipse.

Not by the General Relativity proposed by Einstein.

The other statements from the options given are prediction of General Relativity.