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seofah
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I go for A for parallelism.
Researchers have announced that..... and that this interaction......
botirvoy

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
C. of which type there are 200,000 worldwide, they can interfere with pacemakers
and
D. 200,000 of which type exist worldwide, interfering with pacemakers, and
E. 200,000 of that type existing worldwide and can interfere with pacemakers, and
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A for me.
Another tough one.
Whats the OA?
+1
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"that and that" construction - A is correct



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