Final answer:
Eastern European aristocracy (option b) had the most influence on early vampire literature.
Step-by-step explanation:
Early vampire literature was influenced by various factors, but the option that had the most influence was Eastern European aristocracy. Folklore and myths from Eastern Europe, such as the legend of Count Dracula, provided the basis for early vampire stories.
Writers like Bram Stoker drew inspiration from Eastern European aristocracy to create iconic vampire characters like Count Dracula. This influence can be seen in popular vampire novels, such as Stoker's 'Dracula.'