Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.
A. scientists learned how to make a synthetic growth hormone, removing it painstakingly
B. scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly
C. scientists learned how to synthesize the growth hormone, it had to be painstakingly removed
D. learning how to make a synthetic growth hormone, scientists had to remove it painstakingly
E. learning how to synthesize the growth hormone, it had to be painstakingly removed by scientists
Synthetic means
artificial.
In A, B and D,
it seems to refer to
a synthetic growth hormone, implying that an ARTIFICIAL hormone was removed from the glands of HUMAN cadavers.
Not the intended meaning.
Eliminate A, B and D.
In E,
learning seems to modify
it, conveying a nonsensical meaning.
The intended meaning is that SCIENTISTS were
learning how to synthesize the growth hormone.
Eliminate E.
The correct answer is
C.
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