The factor that helps to determine weather patterns across South America is elevation. The correct option among all the options that are given in the question is the second option or option "B". There might be some other factors as well but this is the major factor for determining the weather patterns of South America.
<span>the majority of people in the united states work in the: service industry
Following the development of technology (such as smart phone and internet) , the service industry has provided the most job oppotunities for American people, since every consumers want to conduct their business remotely and efficiently</span>
I believe the answer is: B.migrant workers.
At that time, the migrant workers was forced to live under a horrible condition since there was no laws that regulate company's treatment toward of its employees. Due to the plight of these workers, united farm workers was created in order to create better situation for the migrant workers.