What were the dates of William K. Grant's two terms as the head U.S. diplomat in Qatar?

A. July 2017 - November 2017 and August 2018 - March 2020
B. August 2017 - November 2018 and March 2020 - present
C. April 2015 - October 2016 and June 2019 - present
D. January 2016 - June 2017 and December 2019 - present
Answer: 