Final answer:
The Showtime series featuring Eva Green as a Victorian medium is 'Penny Dreadful'. It intertwines various literary figures set in the Victorian era, with Vanessa Ives as the main character.
Step-by-step explanation:
The Showtime series that stars Eva Green as a Victorian era medium with a troubled past is A) Penny Dreadful. This show is a horror drama that combines classic literary characters from novels like Dracula, Frankenstein, and The Picture of Dorian Gray into a single narrative set in Victorian London. Eva Green's character, Vanessa Ives, is a complex and central figure throughout the series, presenting a nuanced portrayal of a medium battling personal demons and supernatural threats.