Explanation
Correct answer: B.
Choice B is the best answer because it most logically completes the text’s discussion of how seismic monitoring and orbital imaging are used to find impact craters on Mars. In this context, “complementary” means combining in such a way that each contributes something the other lacks. The text describes how two data sources work together: seismic monitoring detects vibrations that indicate the rough location of an impact, and orbital imaging is then used to examine that limited area in detail to pinpoint the exact location of the crater. Each method does something the other does not—seismic monitoring narrows the search area, while orbital imaging provides the precise location—and together they accomplish what neither could alone. This context supports the idea that the two methods’ roles are complementary.
Why the other choices are wrong
Choice A
Choice A is incorrect because describing the roles of seismic monitoring and orbital imaging as “interchangeable,” or able to be substituted for each other, would contradict the text. The text indicates that the two methods perform different functions in sequence (seismic monitoring narrows the area; orbital imaging pinpoints the crater), so they cannot be substituted for each other.
Choice C
Choice C is incorrect because describing the roles of seismic monitoring and orbital imaging as “exhaustive,” or comprehensive in covering all possibilities, wouldn’t be logical in context. The text describes how the two methods work together to perform a particular two-step task (locating new impact craters), not whether they collectively address every possible aspect of Mars research.
Choice D
Choice D is incorrect because describing the roles of seismic monitoring and orbital imaging as “redundant,” or unnecessarily duplicative, would contradict the text. The text indicates that each method performs a distinct function in finding impact craters on Mars—rough localization versus precise localization—so neither method duplicates the other’s contribution.