Answer:Ultraviolet waves have higher frequencies than radio waves.
Step-by-step explanation:
The waves arranged in increasing order of frequency are radio waves,infrared waves,x-rays,ultraviolet waves.
Option A:
Ultraviolet waves have higher frequencies than radio waves.This agrees with the above order.
Option B:
X-rays have lower frequencies than infrared waves.This does not agree with the above order.
Option C:
Radio waves have higher frequency than x-rays.This does not agree with the above order.
Option D:
Gamma rays have lower frequencies than ultraviolet waves.This does not agree with the above order.
So,option A is correct.