What would be the error in the following sentences:
1. Numerous vegetarians believe that there are undoubtedly, a wealth of good reasons to stop eating meat.
(Does the 'are' needs to be changed to 'is'? Since "a wealth of reasons" is similar to "a number of reasons", I think the 'are' remains as it is.
2. There is a difference in the way the term turnover and the term revenue is used in business across the Atlantic; in the United States, turnover refers to how rapidly the inventory acquisition and transaction occurs whereas in Europe turnover refers to a company's income, known in the States as revenue.
A. use of the term turnover and the term revenue in business across the Atlantic; in the United States, turnover refers to how rapidly the inventory acquisition and transaction occurs whereas
B. usage of the term turnover and the term revenue in business across the Atlantic; the rapidness of the inventory acquisition and transaction is called turnover in the United States whereas
Which one is correct?