A little math question for junior rocket funs

The figure above shows a rocket taking off vertically. When the rocket reaches a height of 12 kilometers, the angles of elevation from points A and B on level ground are 84.1o and 62.7o, respectively. What is the distance between points A and B?

(A) 0.97 km
(B) 6.36 km
(C) 7.43 km
(D) 22.60 km
(E) 139.37 km

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