Answer:
Option D.
Step-by-step explanation:
From the stem and leaf plot attached, we will write down the scores of the students which are less than 88 points.
52, 64, 66, 70, 71, 74, 76, 78, 78, 78, 80, 81, 82, 83, 84, 86.
Rest all the scores are either 88 or above 88.
Therefore, number of students will be 16.
Option D. is the answer.