Mark's aunt is researching the effect of car pollution on smog levels in southern California. She wants to learn more about this. Which keyword(s) should she type into an Internet search engine?
A.
car research
B.
aunt
C.
southern California levels
D.
car pollution in California

D) Car pollution in California

Explanation:

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: