If We Were to Use a Telescope and a Black

If we were to use a telescope and a black hole passes between our line of sight and a star, wewould see the image of the star in the telescope:

A) darken because the black hole would block some or all of the light.
B) blur because the black hole would gravitationally deflect the light.
C) sharpen because the black hole would gravitationally deflect the light.
D) remain constant because the diameter of the black hole is so small compared to the star.