Question

if a galaxy cluster contained more dark matter than usual, then the light from a distant quasar located behind the cluster would be
unaffected.
less gravitationally lensed.
more gravitationally lensed.

Explanation:

Dark matter has mass and creates gravitational fields. More dark matter means a stronger gravitational field. Gravitational lensing is the bending of light due to gravity. So, more dark matter would lead to more gravitational lensing of the quasar's light.

Answer:

C. more gravitationally lensed