tter
He put the glass to his lips and drank at one gulp. A cry followed; he reeled, staggered, clutched at the table and held on, staring with injected eyes, gasping with open mouth; and as I looked there came, I thought, a change—he seemed to swell—his face became suddenly black and the features seemed to melt and alter—and the next moment, I had sprung to my feet and leaped back against the wall, my arms raised to shield me from that prodigy, my mind submerged in terror.

“O God!” I screamed, and “O God!” again and again; for there before my eyes—pale and shaken, and half fainting, and groping before him with his hands, like a man restored from death—there stood Henry Jekyll!

–The Strange Case of Dr. Jekyll and Mr. Hyde,
Robert Louis Stevenson

What important event in the plot does Dr. Lanyon’s letter reveal?

Mr. Hyde confessed to the murder of Dr. Jekyll.
Dr. Lanyon knew what was wrong with Dr. Jekyll all along.
Mr. Hyde is holding Dr. Jekyll captive.
Mr. Hyde and Dr. Jekyll are the same person