Rivaling the pyramids of Egypt or even the ancient cities of the Maya as an achievement, the army of terra-cotta warriors created to protect Qin Shi Huang, China's first emperor, in his afterlife is more than 2,000 years old and took 700,000 artisans more than 36 years to complete them.
(A) the army of terra-cotta warriors created to protect
Qin Shi Huang, China’s fi rst emperor, in his afterlife
is more than 2,000 years old and took 700,000
artisans more than 36 years to complete
(B) Qin Shi Huang, China’s fi rst emperor, was
protected in his afterlife by an army of terracotta
warriors that was created more than
2,000 years ago by 700,000 artisans who took
more than 36 years to complete it
(C) it took 700,000 artisans more than 36 years to
create an army of terra-cotta warriors more than
2,000 years ago that would protect Qin Shi
Huang, China’s fi rst emperor, in his afterlife
(D) more than 2,000 years ago, 700,000 artisans
worked more than 36 years to create an army of
terra-cotta warriors to protect Qin Shi Huang,
China’s fi rst emperor, in his afterlife
(E) more than 36 years were needed to complete
the army of terra-cotta warriors that 700,000
artisans created 2,000 years ago to protect Qin
Shi Huang, China’s fi rst emperor, in his afterlife

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This problem is from OG 12th edition.
The answer is A. Shouldn't the " the army of terra-cotta warriors created to protect Qin .." be in passive form? " the army of terra-cotta warriors was created to ..." makes more sense. Any advice.

OG questions are banned, but i'll leave this one up since it's also in the GMAT PREP software (which is allowed on this forum because it's distributed for free).

here's an existing thread:
gmatprep-t6880.html

please post future questions on that thread, not this one ... and please search the forum for existing threads!
thanks.

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the short answer to your question is that, in this sentence, "created" isn't a verb -- it's a past participle. in other words, it's the same part of speech as things like thrown, given, driven, and done (as opposed to the actual past-tense verbs, threw, gave, drove, and did).
such participles are, grammatically, adjectives, not verbs; the primary difference from normal adjectives is that these ones are most often placed after the noun that's being modified (while normal adjectives are most often placed before the noun).