21. 假設有一個學生資料表 students，包含 name 和 score 欄位，想要找出成績最高的學生，哪一個 SQL 查詢是正確的？ (A) SELECT name FROM students ORDER BY score ASC LIMIT 1; (B) SELECT name FROM students WHERE score = MAX(score); (C) SELECT name FROM students ORDER BY score DESC LIMIT 1; (D) SELECT MAX(name) FROM students;