It's not a very good question, because it has two answers - B and D, either present perfect or present simple. B seems to be the better answer, but D is also possible.

In my opinion both B and D are possible and correct. I would be more likely to use B. The present perfect just emphasizes that the act has been completed. http://www.usingenglish.com/forum/threads/178929-As-soon-as-present-perfect-or-present-simple http://www.english-test.net/forum/ftopic136114.html

Leave (present simple after " As soon as " time expression)

hi! im Jason in New York. im happy to help you improve your spoken english, if you need help. please add me to QQ: 1990992857 or ooVoo: 6214337481 . Let's lets be friends! :)

D) leave