Which description(s) characterize Dr. Jekyll in this
excerpt? Check all that apply.

shocked
confident
concerned
amused
anxious

shocked , concerned  and anxious.

Explanation:

Strange Case of Dr Jekyll and Mr Hyde, a 1886 novel written by Robert Stevenson, tells a story about a London legal practitioner who decides to explore the strange events related to Dr Jekyll and Edward Hyde.

One August night, during his sleep, Jekyll becomes Hyde. In this particular excerpt, Jekyll is shocked that he "had gone to bed Henry Jekyll", and woke up as "Edward Hyde." This transformation is inexplicable, and we can only imagine how deeply shocked Jekyll was upon this discovery. The choice of words - "terror", "horror-struck", indicates that he is concerned and anxious about this strange event.

can you give some possible answers

it is believed to be alfred, lord himself