Correct Answer - B
Let AB be the string and B be the kite.
Let AC be the horizontal and let `BC _|_ AC`.
Let `angleCAB = theta`,
`BC = 30 m` and `AB = 60 m`. Then,
`(BC)/(AB) = sin theta rArr sin theta = (30)/(60) = 1/2 rArr sin theta = sin 30^(@) rArr theta = 30^(@)`.
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