The correct answer is D. An advance organizer is a tool used to introduce the lesson topic and illustrate the relationship between what the students are about to learn and the information they have already learned. They are used during expository instruction, which is the use of an expert to present information in a way that makes it easy for students to make connections from one concept to the next. Meaningful learning refers to the concept that the learned knowledge is fully understood by the individual and that the individual knows how that specific fact relates to other stored facts (stored in your brain that is). The definition of meaningful learning is associated with the use of advance organizers.