Hi there!
Let's use the relationships for external secants.
Equation:
14(14 + 16) = 10(10 + EC)
Solving:
420 = 100 + 10EC
320 = 10EC
EC = 32
EC = 32 + 10
EC = 42
ANSWER:
D - 42
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!