A scientist wants to analyze signals from outer space. Her lab has sensors to dect sound waves, radio waves, and seismic waves. Which of these sensors will provide the best information?

The correct answer is "radio waves".

In fact, sound waves and seismic waves are mechanical waves, which means they are waves which move through a medium, but space is basically vacuum, so there is no medium and they cannot propagate through vacuum. Instead, radio waves are electromagnetic waves, which can also propagate without a medium, so radio waves can also propagate through space.