Answer:
C. he is nervous because the driver is calm during an unsettling situation.
Step-by-step explanation:
The narrator was afraid, and so are the horses but the driver was not sharing their fear at all. The narrator also felt unsettling and insecure on that journey but the driver did not express his feelings at all.
other options are considered incorrect as A, the driver did not abandon him at all, as he reappeared again. for B, he knew that he will be staying over to Count Dracula's place, and for D he was feeling nervous and afraid so he must not be annoyed at all.