What Is the Issue Competition Model of Party Competition

What is the Issue Competition model of party competition?

A) Parties focus on making the election about those issues on which they are considered the most competent by voters.
B) Party competition is fought exclusively on the basis of issues.
C) In each election, one issue is the most salient and whichever party is most congruent in this issue will win the election.
D) Parties can only win elections when they are the only party owning a particular issue.