Ahmed, Brian, Chloe, Danielle, Ethel, Francis and George have to choose a Form Captain from among themselves. They decide to stand in a circle, in alphabetical order, and to count round (in the same order) rejecting every third person they come to; that person then leaves the circle. The last one left is to be Form Captain. Ahmed is eventually elected Form Captain. Where must the counting have started?
$A$ Ahmed $\quad B$ Brian $\quad C$ Danielle $\quad D$ Ethel $\quad E$ George