B's kite height is100 * sin45 = 50 *1.414 = 70.7 m.

The kite height of C is 95 * SIN 45 = 47.5 *1.414 = 67.2m..

The height of Ding's kite is 90 * SIN 60 = 45 * 1.732 = 77.94 meters.

So Ding's kite is the tallest.