question_answer

In an acute angled  \[\Delta ABC\], \[a=4\text{ }cm\], \[b=6\text{ }cm\], \[\sin B=\frac{3}{4}\], then the value of angle A is

A) \[30{}^\circ \]  

B) \[45{}^\circ \]

C) \[60{}^\circ \]

D) None of these