a collection of one or more outcomes is called an
Outcome (probability) Since individual outcomes may be of little practical interest, or because there may be prohibitively (even infinitely) many of them, outcomes are grouped into sets of outcomes that satisfy some condition, which are called "events." The collection of all such events is a sigma-algebra.[3]
Multiple choice Multiple choice items consist of a stem and several alternative answers, among which are the correct ("keyed") answer and one or more incorrect ("distractor") answers. The stem is the beginning part of the item that presents the item as a problem to be solved, a question asked of the respondent, or an incomplete statement to be completed, as well as any other relevant information. The options are the possible answers that the examinee can choose from, with the correct answer called the key and the incorrect answers called distractors.[4] Only one answer can be keyed as correct. This contrasts with multiple response items in which more than one answer may be keyed as correct.