Research on human motor control could help "save the world" in the sense that
A) Enhancements of already tested technology may make it possible to harvest more energy from people's walking and other activities
B) Enhancements of already tested technology may make it possible to harvest more energy from people's backpacks and other objects they carry or manipulate
C) It may become possible to develop autonomous robots that could perform missions in outer space that humans cannot perform that could, conceivably, be needed to save our planet
D) All of the above