Does Whereas require parallelism . The OG says that the following Sc does require Parallelism

Whereas a ramjet generally cannot achieve high
speeds without the initial assistance of a rocket,
high speeds can be attained by scramjets, or
supersonic combustion ramjets, in that they reduce
airflow compression at the entrance of the engine
and letting air pass through at supersonic speeds.


(A) high speeds can be attained by scramjets, or
supersonic combustion ramjets, in that they
reduce

(B) that high speeds can be attained by scramjets,
or supersonic combustion ramjets, is a result of
their reducing

(C) the ability of scramjets, or supersonic
combustion ramjets, to achieve high speeds is
because they reduce

(D) scramjets, or supersonic combustion ramjets,
have the ability of attaining high speeds when
reducing

(E) scramjets, or supersonic combustion ramjets,
can attain high speeds by reducing

But the OG doesn't broach the topic of parallelism while considering the SC below

Over 75 percent of the energy produced in France
derives from nuclear power, while in Germany it is just
over 33 percent.
(A) while in Germany it is just over 33 percent
(B) compared to Germany, which uses just over 33
percent
(C) whereas nuclear power accounts for just over
33 percent of the energy produced in Germany
(D) whereas just over 33 percent of the energy
comes from nuclear power in Germany
(E) compared with the energy from nuclear power in
Germany, where it is just over 33 percent