885 section 06 12

12.   A report by the laceName>AmericanlaceName> laceType>AcademylaceType> for the Advancement of Science has concluded that much of the currently uncontrolled dioxins to which North Americans are exposed comes from the incineration of wastes.

(A) much of the currently uncontrolled dioxins to which North Americans are exposed comes

(B) much of the currently uncontrolled dioxins that North Americans are exposed to come

(C) much of the dioxins that are currently uncontrolled and that North Americans are exposed to comes

(D) many of the dioxins that are currently uncontrolled and North Americans are exposed to come

(E) many of the currently uncontrolled dioxins to which North Americans are exposed come

答案（E），dioxins 是可数名词？

[uncountable and countable]
a very poisonous chemical used in industry and farming