In the 1980's, astronomer Bohdan Paczynski proposed a way of determining whether the enormous dark halo constituting the outermost part of the Milky Way galaxy is composed of MACHO's (massive compact halo objects), which are astronomical objects too dim to be visible. Paczynski reasoned that if MACHO's make up this halo, a MACHO would occasionally drift in front of a star in the Large Magellanic Cloud, a bright galaxy near the Milky Way. The gravity of a MACHO that had so drifted, astronomers agree, would cause the star's light rays, which would otherwise diverge, to bend together so that, as observed from Earth, the star would temporarily appear to brighten, a process known as microlensing. Because many individual stars are of intrinsically variable brightness, some astronomers have contended that the brightening of intrinsically variable stars can be mistaken for microlensing. However, whereas the different colors of light emitted by an intrinsically variable star are affected differently when the star brightens, all of a star's colors are equally affected by microlensing. Thus, if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light. Moreover, it is highly unlikely that a star in the Large Magellanic Cloud will undergo microlensing more than once, because the chance that a second MACHO would pass in front of exactly the same star is minuscule.
It can be inferred from the passage that which of the following would constitute the strongest evidence of the microlensing of a star in the Large Magellanic Cloud?
The brightness of such a star is observed to vary at irregular intervals.
The brightening of such a star is observed to be of shorter duration than the brightening of neighboring stars.
The red light of such a star is observed to be brighter than its yellow light and its blue light.
The red light, yellow light, and blue light of such a star are observed to be magnified temporarily by the same factor.
The red light of such a star is observed to have increased tenfold.
根据题设，定位到“however”以后。文章提出了两点原因能证明“microlensing”在“Large Magellanic Cloud”中是存在的。从目前来看，应该是第一点比较重要。因为后一条看起来不是很容易观测。具体可以通过选项来排除。
C选项：这样的星星被观测到的红光比黄光和蓝光更加明亮。这个选项说反了，定位在“if a MACHO magnifies a star's red light tenfold, it will do the same to the star's blue light and yellow light.”，原意应该是会同等的增强各种颜色的光。