1. A/An that's part of a prepositional phrase is known as the object of the preposition.
A. verb
B. adverb
C. adjective
D. noun

answer: the tobacco industry has traditionally been one of the most important industries in north carolina and a backbone of the state's agricultural heritage. yet as the north carolina economy continues to transition from an agricultural economy to a manufacturing and, increasingly, service-based economy, the industry faces new challenges, both at home and abroad

explanation:

c.    

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