Which of the following best describes a constructivist classroom?
a) Instruction is student-centered, with the teacher acting as a guide and facilitator for student learning.
b) Instruction is focused on a structured curriculum, with the teacher ensuring all content is addressed by the students.
c) Instruction is accompanied by specific positive and negative reinforcements, controlled by the teacher.
d) Instruction is driven by defined goals and benchmarks, and each student gains the same knowledge.
e) Instruction is lecture-based, with students responsible for taking notes and asking questions.