The following graph shows the gas speed distributions for four different gases, all at the same temperature. Which of the curves is for the lightest gas? 
Definitions:
Modern Humans
Homo sapiens, the species to which all current human beings belong, characterized by a capacity for complex language and symbolic thought.
Australopithecine
A genus of hominins from which modern humans are believed to have evolved, known for bipedal locomotion and relatively small brains.
Homo Habilis
"Handy human." The first fossil members of the genus Homo appearing 2.5 million years ago, with larger brains and smaller faces than australopithecines.
Homo Habilis
An extinct species of early human believed to have lived around 2.1 to 1.5 million years ago, known for using stone tools.
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