24. According to paragraph 4, what psychological function does the growing portfolio of sketches serve for the developing artist? (A) The portfolio affirms the artist’s progress by offering visible evidence of both skill development and personal investment. (B) The sketches illustrate the artist’s changing preferences in subject matter rather than any growth in technical control. (C) The accumulation of work encourages a backward-looking mindset that may hinder creative risk-taking. (D) The visual archive reinforces routine but does little to advance an understanding of artistic intention.