How do scientists know that dark matter exists?

(1 point)
They notice that light seems to "disappear" in certain areas of galaxies.
O Something has to be there to form superclusters; gravity alone wouldn't do it.
It's the only explanation for the redshifts phenomenon seen in some celestial objects.
They observe gravitational lensing bending the light of other objects in space

All the given options provide evidence for the existence of dark matter, but the most direct and widely accepted observation is the gravitational lensing of light. When scientists study the bending of light from distant objects by the gravitational pull of dark matter, it confirms the presence of an invisible mass in the universe. By measuring the gravitational lensing effect, researchers can indirectly infer the amount of dark matter present in a particular region. Therefore, the correct answer is: They observe gravitational lensing bending the light of other objects in space.