This statement best summarizes the paragraph: The narrator wakes Simon Wheeler and would be grateful if Wheeler can tell the narrator about a Rev. Leonidas W. Smily (C).
More than on the description of Mr Wheeler, the excerpt is focused on the dialogue between the narrator and Wheeler. Let's observe the elements of the answer one by one.
- "The narrator wakes Simon Wheeler" – The exchange starts by the narrator's presence causing Mr Wheeler to wake up and stand up: "he roused up."
- The narrator would like Wheeler to tell him "about a Rev. Leonidas W. Smily" – We are told, through indirect speech, that the narrator was asked "to make some inquiries about ... Rev. Leonidas W. Smily;" in other words, to collect information about the reverend.
- The narrator "would be grateful" for such information – When the narrator says he would "feel under many obligations to [Wheeler]," that means that he would owe him. We can guess that he would probably reward Wheeler.