Lets take this question
A report by the American Academy 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
I want to specifically talk about option D. When I looked at Charles' videos on youtube he rejected the 4th option due to parallelism issues but I constantly keeping thinking that if you keep "many of the dioxins that" as the stem instead of "many of the dioxins", then the part before and after "and" goes completely fine with the stem. What is wrong in this logic ?