in thE pAssAgE, thE Author is primArily ConCErnED with
A．hypothEsizing ABout A sEt oF CirCumstAnCEs
B．ChroniCling thE EmErgEnCE oF A phEnomEnon
C．CompAring two ConFliCting points oF viEw
D．CAtAloging thE CAusE AnD EFFECts oF A phEnomEnon
E．(E) Arguing thE nECEssity oF solving A proBlEm