Starvation is the most fearful and the most dreaded of all the anxieties that haunt (萦绕)the minds and the imaginations of humankind. Humankind's every effort has been directed to combat it, and this will likely continue until the end of time. Its prevention has been the greatest motivation that human beings have had to progress socially, intellectually and technologically. It is the real enemy. Like other enemies, its presence brings forth the best that is in us and urges us to do greater things in struggle. In the continuous fight against hunger and cold, humankind has progressed in remarkable ways and done far more than what was absolutely necessary to merely fend off against starvation. What has been the greatest motivation for humankind according to the passage?A. To stop starvation.B. To be the best we can be.C. To find who our real enemies are.