[QA] Although thunder and lightning are produced at the same time, light waves travel faster________, so we see the lightning before we hear the thunder.

Question:

Although thunder and lightning are produced at the same time, light waves travel faster________, so we see the lightning before we hear the thunder.

• A.
  do sound waves
• B.
  than sound waves are
• C.
  than sound waves do
• D.
  sound waves