Concept:A portfolio is a collection of tangible work samples that show a person’s skills and progress over time.Explanation:Drawings, worksheets, and photographs can all be physically or digitally included in a portfolio as evidence of learning or ability. Classroom discussion, however, is an interactive activity that cannot be stored or displayed as a permanent artifact. It may influence the portfolio’s content but is not itself a part of it. Hence, classroom discussion is not a component of a portfolio.Answer:C. Classroom discussion