Concept:An intra-party activity is an internal process used by a political party to choose its candidates.Explanation:Primary elections are held within a political party to select the candidate who will represent the party.They occur before the main general election.In a closed primary, only registered party members vote; in an open primary, all voters may participate.General elections involve all parties and voters. Mid-term and bye-elections do not select party candidates.Therefore, the correct description of this intra-party selection process is a primary election.Answer:A. primary election