Question

Gravitational waves

• A. propagate at the speed of light.
• B. carry energy and momentum.
• C. are ripples in time and space.
• D. None of these.

Answer 1

Answer: (A), (B), (C)

The correct options are
A propagate at the speed of light.
B carry energy and momentum.
C are ripples in time and space.

Gravitational waves are 'ripples' in the fabric of space-time caused by some of the most violent and energetic processes in the Universe. Furthermore, these ripples would travel at the speed of light through the Universe, they do carry energy and momentum.

so the answer is A,B and C.