Which sequence shows the different types of electromagnetic waves arranged in an increasing order of their frequency? 
 A.)radio waves, microwaves, visible light, x-rays 
 B.)x-rays, visible light, microwaves, radio waves 
 C.)visible light, radio waves, x-rays, microwaves 
 D.)microwaves, x-rays, radio waves, visible light 
 E.)visible light, x-rays, radio waves, microwaves