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It should be A, please correct the underlined part of the question.
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Researchers have announced that the magnetic fields emitted by one manufacturer’s
security surveillance system, of which type there are 200,000 worldwide, can interfere
with pacemakers and that this interaction can bring on missed or irregular heartbeats,
nausea, breathlessness, dizziness, and even fainting.
A. of which type there are 200,000 worldwide, can interfere with pacemakers and
that
B. of which, worldwide, there are 200,000 of that type, and which can interfere with
pacemakers, and - which usage is wrong
C. of which type there are 200,000 worldwide, they can interfere with pacemakers
and - announced that..........and that is required...this is not parallel
D. 200,000 of which type exist worldwide, interfering with pacemakers, andnot parallel
E. 200,000 of that type existing worldwide and can interfere with pacemakers, andnot parallel



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