The graph that represents the percentage of lighted side of the moon is ; ( 4 ) i.e. The fourth graph .
Given that the observer is stationed at the Northern Hemisphere, as the moon orbits around the sun following a parabolic path, the observer will observe a fully lighted moon ( i.e. 100% ) when the moon get to the center of its parabolic path because at this position the earth cannot cast a shadow on any part of the moon.
Hence we can conclude that the graph that represents the percentage of the lighted side of the moon is Graph 4
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