I believe the answer is A
The doctor. most likely, is referring to the settling process. In this process, the muscles are still adjusting or on the process of healing so he is experiencing some back pains due to this. Once the muscles are settled in place, he would feel normal again.
Yes,, lupus is correct. people with this disease are extremely sensitive to sunlight and they can sometimes develop burns, rashes, or even skin cancer if not treated properly. the best way for people with lupus to prevent this is by wearing sunscreen and covering up as much as possible.
let me know if you have any further questions
:)