21、 Which of the following descriptions about “Project-based Learning” (PBL) is wrong? (A) PBL is a learner-centered pedagogical approach which aims to foster students to become self-directed learners. (B) PBL encourages students to gather information on topics regarding real-world problems but not necessarily requests students to seek a solution to the problems being explored. (C) PBL scaffolds students to discuss the real-world topics with peers, share what they have learned among peers, and collaboratively accomplish specific learning goals. (D) PBL relies a lot on learning groups and encourages students to take responsibility for their own learning.