Which of the following waves travels at the greatest speed?
a.
seismic waves traveling through the earth's crust
b.
electromagnetic waves traveling through outer space
c.
sound waves traveling through air
d.
sound waves traveling through a solid

Electromagnetic waves going through outer space has the greatest speed among all kind of waves.  

Option B

Explanation:  

Electromagnetic waves are the waves that can go through the vaccum of space. Electromagnetic waves are made by the vibration of an electric charge. This vibration makes a wave that has both an "electric and magnetic nature". An electromagnetic wave transfers energy through a vaccum at a speed of (speed esteem ordinarily depicted by the sign c). The spread of an electromagnetic wave through a material medium happens at a net speed which is under .

it would be c. predictability