If the magnitudes of vectors $\overrightarrow{A},\overrightarrow{B},\overrightarrow{C}$ are 3,4 and $\theta$ units respectively and if $\overrightarrow{A}+\overrightarrow{B}=\overrightarrow{C},$ then the angle between $\overrightarrow{A}$ and $\overrightarrow{B}$ is

Question

$\begin{array}{1 1}(A)\;\large\frac{\pi}{4} \\(B)\;\large\frac{\pi}{2} \\(C)\;\tan^{-1}(0.75)\\(D)\;\cos^{-1}(0.6) \end{array} $