What Is a Key Reason That Gravitational Waves Are So

What is a key reason that gravitational waves are so much harder to detect than electro-magnetic (e-m) waves?

A) gravitational waves don't create any kind of disturbance the way e-m waves do
B) gravitational waves are so strong, they really shake our detectors, making measurements difficult
C) gravitational waves get all mixed up with sound waves in the Earth's atmosphere, and are therefore hard to distinguish from all the sound
D) gravitational waves are much weaker than e-m waves, and therefore require very, very precise equipment to detect
E) you can't fool me; gravitational waves are much easier to detect than e-m waves