Jekyll’s letter in the excerpt from the strange case of dr. jekyll and mr. hyde reveals that
lanyon has already made it clear that he does not like jekyll.
jekyll would like to be better friends with lanyon in the future.
lanyon already refused to jekyll at an earlier time.
jekyll is in a desperate situation and needs from lanyon.

Dr. Lanyon receives a letter from Dr. Jekyll asking him to do him a favor, but it was a difficult one. He seemed in distressed and pleaded in the name of their friendship. This shows that Jekyll is in a desperate situation and needs help from Lanyon.

You can see and feel the desperation in these lines, "Lanyon, my life, my honour my reason, are all at your mercy; if you fail me to-night I am lost. " 

JEYKYLL IS IN A DESPERATE SITUATION AND NEEDS HELP FROM LANYON IS YOUR ANSWER x

I’m not sure what it is i sorry

C. c is the correct answer.