Answer: Brainstorming is (A.) a process in which a group or an individual comes up with ideas.
Step-by-step explanation: Brainstorming is a technique that can be used by a single individual or by a group and that consists in giving ideas about a particular issue in a spontaneous way. This technique can allow an individual or a group to find a solution for a problem or to understand a subject easily. Moreover, brainstorming is a technique mainly used by teachers when they are trying to introduce a new topic to their students.