Question

light is an electromagnetic wave. that means its a wave of energy that can travel through empty space. light is special because it is the only kind of electromagnetic wave that humans can see. when you see an object, you are actually seeing light hit it and then bounce into your eyes. there are other types of electromagnetic waves, like the microwaves that heat your food, but humans cant see them. electromagnetic waves a can all be seen by humans. b don’t need matter to travel. c are always invisible to humans. d only travel through solid food.

Explanation:

The text states that light is an electromagnetic wave and it can travel through empty space, which means electromagnetic waves don't need matter to travel. Only light among electromagnetic waves is visible to humans, so options A and C are incorrect. There is no mention that electromagnetic - waves only travel through solid food, so option D is wrong.

Answer:

B. don’t need matter to travel.