Which instructional method allows instructors to engage with the entire group and encourage replies?

The choice of class discussions as the correct answer is fitting because this instructional method promotes active engagement from all participants. During class discussions, instructors can pose questions, encourage sharing of ideas and experiences, and facilitate dialogues among group members. This environment not only helps to reinforce learning by allowing participants to articulate their thoughts but also fosters a sense of community and collaboration.

In contrast, while demonstrations, illustrated lectures, and case studies are valuable instructional techniques, they do not inherently encourage widespread interaction among the group. Demonstrations focus on showing a skill or process, which may limit interaction to questions primarily directed at the instructor. Illustrated lectures are informative presentations that typically involve a one-way transfer of knowledge, where students may listen more than engage. Case studies can promote discussion but generally require participants to analyze specific situations rather than engage in a broader conversation. Therefore, class discussions uniquely enable involvement from the entire group, making it the most effective method for engaging everyone and encouraging replies.