The correct statement is option 2: "Gravitational waves were predicted by Albert Einstein in 1916 on the basis of his theory of General Relativity, and gravitational waves do also exist in the Newtonian theory of Gravitation. Gravitational waves are to be detected by very sensitive detectors known as interferometers."

Option 1 is incorrect because it states that gravitational waves were only predicted by Albert Einstein in 1916 based on his theory of General Relativity. This is not true as gravitational waves can also exist in the Newtonian theory of gravitation.

Option 3 is incorrect because it states that gravitational waves are detected by very sensitive detectors known as interferometes, when the correct term is "interferometers." Interferometers are indeed used to detect gravitational waves, but this option is incorrect because it does not include the correct prediction of gravitational waves by Einstein in the Newtonian theory of gravitation.

Option 4 includes all three correct statements, making it an incorrect answer because the correct option is 2.