Time (weeks) Level 0 2 6 10 210 200 190 180 21. The table above gives the level of a person's cholesterol at different times during a 10-week treatment period. What is the average level over this 10-week period obtained by using a trapezoidal approximation with the subintervals [0, 2], [2, 6], and [6, 10] ? (A) 188 (B) 193 (C) 195 (D) 198