A mass of M kg is suspened by a weightless string. The horizontal force that is required to displace it until the string makes an angle of $45^{\circ}$ with the initial vertical direction is :

Question

( A ) $Mg(\sqrt{2}-1)$
( B ) $Mg \sqrt{2}$
( C ) $Mg(\sqrt{2} + 1)$
( D ) $\frac{Mg}{\sqrt{2}}$