Social-cognitive theorists would suggest that the best way to predict a political candidate's performance effectiveness after election is to assess that individual's?

past performance in situations involving similar responsibilities

Explanation:

In an electoral system where the candidates seek electoral votes by themselves, the behaviors of the politicians competing, their skills and knowledge and their integrity are the key things to be looked at. It is also important, as commented by Social-cognitive theorists, that a thorough analysis and judgment of their past performance in office be made as a way of predicting their likely performances in the new political positions they seek.