GMAT Sentence Correction (SC) | American productivity is declining in relation to Europes;

In addition to daagh sir's points, please note the following errors purely due to comparison issues:

A. Correct.
The energy expendedper unit of production in the United States isas much as twice that (energy) expended in West Germany.

The energy expended in USA is twicethe energy expended in USA . The blue and the pink parts are parallel. (
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