Respuesta :

Answer:

B 12.

Step-by-step explanation:

BE = ED  (as E is the center of BD - property of a kite).

By Pythagoras:

10^2 = 8^2 + BE^2

BE^2 = 10^2 - 8^2 = 36

BE = 6

So BD = 2*6 = 12.