The student wants to emphasize the mass of Sirius A. Which choice most effectively uses relevant information from the notes to accomplish this goal?
A
The mass of stars, like Proxima Centauri, can be described in units called solar masses.
B
In astronomy, the mass of stars can be described in units called solar masses, and one solar mass is roughly equal to the mass of the Sun.
C
The Sun is more massive than Proxima Centauri, which has a mass of 0.122 solar masses.
D
With a mass of 2.063 solar masses, Sirius A is more massive than the Sun.
Explanation
Correct answer: D.
Choice D is the best answer. The sentence emphasizes the mass of Sirius A, noting that it has a mass of 2.063 solar masses and that it is larger than the Sun.
Why the other choices are wrong
Choice A
Choice A is incorrect. The sentence makes a generalization about how the mass of stars can be measured; it doesn’t emphasize the mass of Sirius A.
Choice B
Choice B is incorrect. The sentence introduces solar masses as a unit of measurement; it doesn’t emphasize the mass of Sirius A.
Choice C
Choice C is incorrect. The sentence emphasizes the mass of Proxima Centauri, not the mass of Sirius A.