thE phrAsE "BAlAnCE oF nAturE" in thE First linE mEAns ______.
A．rEDuCing thE populAtion oF.prEDAtors AnD pArAsitEs
B．kEEping thE right numBEr oF AnimAls For thE right Amount oF FooD
C．kEEping thE rAtio oF smAll gAmE to prEDAtors
D．Driving AnimAls to mAss migrAtions