What does Jonathan Harker see that causes him to go pale as he walks down Piccadilly?

A) A group of menacing figures lurking in the shadows
B) A horrifying accident involving a horse-drawn carriage
C) A familiar face from his past that he thought he would never see again
D) A grotesque and bloodthirsty creature feasting on a helpless victim
E) A haunting apparition of a deceased loved one
F) A disturbing message scrawled in blood on a nearby wall