it CAn BE inFErrED From thE pAssAgE thAt BrAin sizE is AssumED to ______.
A．BE An inDiCAtor oF CognitivE ABility
B．vAry Among inDiviDuAls within A spECiEs
C．BE rElAtED to FooD Consumption
D．CorrEsponD lo lEvEls oF ACtivity