OG12-60 While all states face similar industrial waste problems, the predominating industries and the regulatory environment of the states obviously determines the types and amounts of waste produced, as well as the cost of disposal.
(A) all states face similar industrial waste problems, the predominating industries and the regulatory environment of the states obviously determines (B) each state faces a similar industrial waste problem, their predominant industries and regulatory environment obviously determine (C) all states face a similar industrial waste problem; their predominating industries and regulatory environment obviously determines (D) each state faces similar industrial waste problems, the predominant industries and the regulatory environment of each state obviously determines (E) all states face similar industrial waste problems, the predominant industries and the regulatory environment of each state obviously determine OG里关于D 说“Each state must be compared to all other states”是什么意思?没看明白~~~~