Hey There!!
Your best answer choice will be is Were.
Because You were the most important person at the time makes sense. But, If you put You was the important person at the time doesn't make sense at all... Hope This Helps!!
By ♡~Itsbrazts♡~
Awnser: Even though kingsolver’s essay addresses scientific information, her use of dialogue introduces different viewpoints which allows the reader to connect more deeply to the information. Readers relate to the dialogue which gives them a sense of familiarity. She uses an anecdote, which incorporates ideas of god and religious ideas. It advances her purpose because it provides a sense of relation to religion, an apparent concept that many practice. today.
By using Pathos and Logos if im not mistaken.