Which christian denomination is represented among america's elite, especially among the ranks of u. s. presidents, all out of proportion to its share of the u. s. population?

It is "The Episcopal Church".

The Episcopal Church is the US-based church of the Anglican Fellowship. A characteristic of importance is the fact that more than a quarter of all leaders of the United States have been Episcopalians. St. John's Episcopal Church, an Episcopal church in Washington, D.C., has been gone to by each sitting president since James Madison.

the answer might be either a or c. can't be too sure , because i searched the web, but no valid answers came through.