Answer:
The correct answer is option C :He began to go wrong, wrong in mind; and though of course I continue to take an interest in him for old sake's sake, as they say, I see and I have seen devilish little of the man.
Step-by-step explanation:
These lines help develop the personality of Doctor Lanyon.
As we know, Lanyon was very correct and had impeccable moral. For him, what Jekyll was doing was appalling.
This is what leads to the Dr and his great friend quarreling, because despite the love he felt for him, he was not going to betray his principles for something that he believed to be totally immoral and against what he believed.
This is the personality of Lanyon and it is these lines that begin to show it.