THE CORRECT ANSWER IS (C).EXTEND OT 3″ TO T′ AND DRAW O′T′.THEN IN...

9. The correct answer is (C).

Extend OT

3″ to T′ and draw O′T′.

Then in right ∆ OT′O′, OO′ = 15″

and OT

= 9

so that O

T

= 12

.