C, the natives didn't have immunities to the diseases
"In September he spent most of his time visiting parks, while in October he mostly flew kites" would be a possible combination, although there are several others you could choose.
Answer:
Pidgin Signed English or PSE or sign language
Explanation:
A very crude signing system. It combines elements of BSL and spoken English to allow communication between hearing people and deaf who only know the strict confines of sign language. It is not recommended but can be used when needed
A) the story uses human characters.