ALTHOUGH THUNDER AND LIGHTNING ARE PRODUCED AT THE SAME TIME, LIGHT WAVES TRAVEL FASTER _____ SO WE SEE THE LIGHTNING BEFORE WE HEAR THE THUNDER

15. - DE THI THU NXB BO GD CO DAP AN
DE THI THU NXB BO GD CO DAP AN
15. 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. than sound waves do B. than sound waves C. do sound waves D. sound waves.