Imagine a Situation Where Two Parties Compete for the Votes

Imagine a situation where two parties compete for the votes of three voters. Ideologically, the actors are aligned along a left-right dimension as shown below. Where will the parties move to maximize votes according to Downs?

A) Party A to Voter 3, Party B to Voter 2.
B) Party A to Voter 2, Party B to Voter 2.
C) Party A to the centre of the line, Party B to Voter 3.
D) Party A to Voter 1, Party B to the centre of the line.