Many environmentalists, and some economists, say that free trade encourages industry to relocate to countries with ineffective or poorly enforced antipollution laws, mostly in the developing world, and that, in order to maintain competitiveness, rich nations have joined this downward slide toward more lax attitudes about pollution.
(B) that, for maintaining competitiveness, rich nations join in this downward slide toward more lax attitudes about pollution
(C) that rich nations join this downward slide toward more lax attitudes about pollution because of wanting to maintain competitiveness
(D) that in rich nations, joining this downward slide toward more lax attitudes about pollution is a result of wanting to maintain competition
(E) that wanting to maintain competition is making rich nations join in this downward slide toward an attitude about pollution that is more lax
這題雖然選對了,可是感覺有點毛毛的,不太說得出來(B)(C)(D)(E)哪裏不好,只是覺得(A)比較通順。有人可以更具體地解釋一下這題在考什麼嗎?