The experimental dipole moment of water molecule is $1.84\;D$ . Calculate the bond angle $H-O-H$ in water molecule , if dipole moment of OH bond is $1.5\;D$

Question

$(A)\;141^{\circ}21' \\ (B)\;145^{\circ} \\(C)\;140^{\circ}20' \\(D)\;139^{\circ}30' $