premise: Clarendon is an urbanized, upper-class neighborhood in Arlington County, Virginia, located between the Rosslyn area and the Ballston area. It was named after Edward Hyde, 1st Earl of Clarendon, a leading statesman and historian of the English Civil War. The main thoroughfares are Wilson Boulevard (one-way westbound) and Clarendon Boulevard (one-way eastbound).
hypothesis: Clarendon has a D.
reason: D in the name.