Sound waves are compression waves, as seen here. the areas of low pressure within a sound wave, area a for example, are called a) amplitudes. b) frequencies. c) rarefactions. d) troughs.

C) Rarefactions is the correct answer.

Sound waves have areas of high and low pressure. The areas of high pressure are called compressions and those of low pressure are called rarefactions.

I hope that helps!

:)

i guess it’s a and b