All across Detroit, whitewashed fences

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All across Detroit, whitewashed fences, new roofs, and freshly painted porches are signs of a brisk urban renewal led by new immigrants, one clapboard house at a time.

A. renewal led by new immigrants, one clapboard house at a time
B. renewal led by new immigrants, with one clapboard house at a time
C. renewal that has been led by new immigrants, with one clapboard house at a time
D. renewal, which had been led by new immigrants, one clapboard house at a time
E. renewal, which has been led by new immigrants and one clapboard house at a time

Can some experts explain the best option?

OA A

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by Vincen » Tue Jan 09, 2018 6:31 am
Why is A the correct answer?

I thought it was C. Experts, can you clarify this SC question for us?

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by GMATGuruNY » Thu Jan 11, 2018 4:06 am
one house at a time is an ADVERB.
For example:
Residents are REBUILDING the neighborhood ONE HOUSE AT A TIME.
Here, one house at a time serves to indicate HOW residents are REBUILDING.
HOW are residents REBUILDING the neighborhood?
They are rebuilding it ONE HOUSE AT A TIME.
Conveyed meaning:
First ONE HOUSE is rebuilt, then ANOTHER HOUSE is rebuilt -- and so on -- until the ENTIRE NEIGHBORHOOD has been rebuilt.

OA to the SC above:
All across Detroit, whitewashed fences, new roofs, and freshly painted porches are signs of a brisk urban renewal led by new immigrants, one clapboard house at a time.

Here, one clapboard house at a time -- an adverb -- seems to be modifying led (the nearest preceding action).
Conveyed meaning:
Urban renewal is being led ONE CLAPBOARD HOUSE AT TIME.
This meaning is nonsensical.
Ignore this SC.
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