Research suggests that much of the documented cases of Nipah virus infection in the human population results from human contact with the saliva of the flying fox.

A) much of the documented cases of Nipah virus infection in the human population results
B) much of the documented cases of Nipah virus infection in the human population result
C) much of the cases of Nipah virus infection that are documented in the human population result
D) many of the cases of Nipah virus infection that are documented in the human population result
E) many of the documented cases of Nipah virus in the human population result

What is the answer?