Final answer:
Among the provided options, the correct answer is that Star A, being more massive, will be hotter and thus have a larger habitable zone compared to Star B.
Step-by-step explanation:
When considering the main-sequence lifetimes of Star A with a mass of 1.5 solar masses and Star B with a mass of 0.8 solar masses, we can determine several things based on stellar astrophysics. Main-sequence stars with higher masses, like Star A, have shorter lifetimes because they burn through their fuel at a much faster rate than lower-mass stars. Although Star A has more mass and thus more hydrogen fuel to burn, its higher luminosity means it uses up this fuel much more quickly. Hence, Star B will actually have a longer main-sequence lifetime than Star A. Moreover, since more massive stars are typically hotter, Star A will indeed be hotter than Star B and, consequently, will possess a larger habitable zone. On that account, the correct answer to the question is option c) Star A will have a larger habitable zone