Final answer:
Evidence strongly suggests that the center of our galaxy contains a supermassive black hole rather than a quasar, pulsar, or neutron star. Observations of energetic emissions and accretion disks in other galaxies support this conclusion. Correct option is d
Step-by-step explanation:
The center of our galaxy, the Milky Way, is home to a supermassive black hole. This black hole has a mass millions to billions of times that of the Sun and likely formed alongside the galaxy billions of years ago.
Evidence from observational astronomy, such as the data from the Hubble Space Telescope showing an accretion disk in the galaxy M87 and the energetics of quasars, supports this conclusion. Quasars are thought to be young galaxies with supermassive black holes at their cores. Hence, the best answer to the question is D. black hole.