Question ID:PT7 S1 Q16 Passage:Comets do not give off their own light but reflect light from other sources, such as the Sun. Scientists estimate the mass of comets by their brightness: the greater a comet’s mass, the more light that comet will reflect. A satellite probe, however, has revealed that the material of which Halley’s comet is composed reflects 60 times less light per unit of mass than had been previously thought. Stem:The statements above, if true, give the most support to which one of the following? Correct Answer Choice:BChoice A:Some comets are composed of material that reflects 60 times more light per unit of mass than the material of which Halley’s comet is composed. Choice B:Previous estimates of the mass of Halley’s comet which were based on its brightness were too low. Choice C:The total amount of light reflected from Halley’s comet is less than scientists had previously thought. Choice D:The reflective properties of the material of which comets are composed vary considerably from comet to comet. Choice E:Scientists need more information before they can make a good estimate of the mass of Halley’s comet.