A block \( A \) kept on an inclined surface just begins to slide if the inclination is \( 30^{\c...

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A block \( A \) kept on an inclined surface just begins to slide if the inclination is \( 30^{\circ} \). The block is replaced by another block \( B \) and it is found that it just begins to slide if the inclination is \( 40^{\circ} \). Then,
(A) mass of \( A \) mass of \( B \)
(B) mass of \( A \) mass of \( B \)
(C) mass of \( A= \) mass of \( B \)
(D) insufficient informatior
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