Answer: The mass of the central black hole in our Milky Way galaxy is estimated to be about 4 million times the mass of the Sun (4 x 10^6 Msun). To calculate the percentage of our galaxy's total mass that the central black hole contains, you can use the following formula:
Percentage = (Black Hole Mass / Total Galaxy Mass) * 100
Percentage = (4 x 10^6 Msun / 200 billion Msun) * 100
Percentage ≈ (0.00002) * 100 ≈ 0.002%
So, the central black hole in our Milky Way galaxy contains approximately 0.002% of the galaxy's total mass. None of the given answer choices (A, B, C, D) are close to this percentage, but if we round it to the nearest option, it would be 0%, which is not exactly correct but the closest option.