show step by step work and explanation for choice

You entered a 1, 500 share short position in Pollution Co. at exist37/share, which is the only position currently in this trading account. The initial margin you were required to post was 50% and the maintenance margin is 35%. You will get a margin call if the equity in your account declines by at least: A. exist5, 500 B. exist6,000 C. exist6, 500 D. exist7,000