Which of the following is NOT an advantage of group discussion?

The choice indicating that a group discussion requires a highly skilled instructor is the correct answer because, while effective facilitation can enhance a group discussion, it is not inherently a requirement for its advantages. Group discussions are designed to facilitate engagement, stimulate critical thinking, and encourage collaboration among students. They can foster an environment where diverse perspectives are shared, allowing for deeper understanding and exploration of the material.

In contrast, the advantages that include stimulating student thinking, encouraging feedback, and promoting thorough learning emphasize the core benefits that group discussions offer. These aspects are fundamental outcomes of students participating in discussions, regardless of the instructor's skill level. A skilled facilitator can certainly enhance the experience, but the primary value of group discussions lies in their ability to engage students actively and promote shared learning experiences.