GMAT Sentence Correction (SC) | Re: QOTD: Some buildings that were destroyed and heavily damaged

Some buildings that were destroyed and heavily damaged in the earthquake last year were constructed in violation of the city's building code.
(A) Some buildings that were destroyed and heavily damaged in the earthquake last year were
Best option out of rest. OR should have been used instead of AND. Correct.
(B) Some buildings that were destroyed or heavily damaged in the earthquake last yearhad been
GMAC prefers simple past for an action that happened in past. Hence Incorrect.
(C) Some buildings
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