The first three options I see are all making-decision process to take action, but the last one is the one that is not like that. Researching is something that is not so close in meaning to what you need. That is why, D is a good option.
A primary election. This is so the voter can choose a candidate from a political party, then to nominate them as the party's candidate
The appropriate response is average daily balance method. This is a typical bookkeeping technique where Visa intrigue charges are computed utilizing the aggregate sum due on a card toward the finish of every day. The normal day by day adjusts adds up to every day's adjust for the charging cycle and partitions by the aggregate number of days in the charging cycle.