They both travel at the same speed. They are both waves. They are both electromagnetic. They both travel through a vacuum.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: How are light and sound similar?
Possibilities:
- They both travel at the same speed.
- They are both waves.
- They are both electromagnetic.
- They both travel through a vacuum.

They are both waves.