Final answer:
Galileo did not see black holes with his telescope because the concept of black holes was not understood during his time.
Step-by-step explanation:
Galileo did not see D) Black holes with his telescope. Galileo made monumental discoveries using his telescope, such as the moons of Jupiter, the craters and mountains on the Moon, the details of sunspots, and the fact that the Milky Way is composed of vast numbers of individual stars. However, during his time, the concept of black holes was not yet understood, and thus he did not observe them.