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Let \( A B C \) be a triangle inscribed in a circle and let \( l_{a}=\frac{m_{a}}{M_{a}} ; l_{b}=\frac{m_{b}}{M_{b}} ; l_{c}=\frac{m_{c}}{M_{c}} \) where \( m_{a}, m_{b}, m_{c} \) are the lengths of the angle bisectors of angles \( A, B \) and \( C \) respectively, internal to the triangle and \( M_{a}, M_{b} \) and \( M_{c} \) are the lengths of these internal angle bisectors extended until they meet the circumcircle.
The minimum value of the expression \( \frac{l_{a}}{\sin ^{2} A}+\frac{l_{b}}{\sin ^{2} B}+\frac{l_{c}}{\sin ^{2} C} \) is :
(a) 2
(b) 3
(c) 4
(d) none of these
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