weather fluctuations...

[Techsavvy]

Whereas scientists, beacause of random fluctuations in the weather, cannot determine the transition from one season to the next by monitoring temperatures on a daily basis, so they cannont determine the onset of global warming by monitoring average annual temperatures.

A) Wheras scientists
B) Just as scientists
C) Like scientists who
D) Inasmuch as a scientist
E) In the same way a scientist

Concerns about public health led to the construction between 1876 and 1904 of three
separate sewer systems to serve metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of
three separate sewer systems to serve
B. Concerns about public health have led to the construction of three separate sewer
systems between 1876 and 1904 to serve
C. Concerns about public health have led between 1876 and 1904 to the construction
of three separate sewer systems for serving
D. There were concerns about public health leading to the construction between 1876
and 1904 of three separate sewer systems serving
E. There were concerns leading between 1876 and 1904 to the construction of three
separate sewer systems for serving

Which option conveys the complete meaning most clearly and concisely?

Kindly give explanations!

[Yankee]

Hi Techsavvy

In your first sentence, I'd pick (B) Just as scientists.
(Reason: Just as ... so = standard idiomatic usage to compare and show similarity)
.
.

In your second sentence, option (A) works best.
(Note, for example, that B and C both attempt to use the present perfect "have led" which is not an appropriate tense in the sentence.)
.

[Techsavvy]

Thnx a lot Yankee...that was a grt help