A thin circular ring of area A is perpendicular to uniform magnetic field of induction B. A small cut is made in the ring and a galvanometer is connected across the ends such that the total resistance of circuit is R. When the ring is suddenly squeezed to zero area, the charge flowing
through galvanometer is

• A

  $\frac{\mathrm{BR}}{\mathrm{A}}$

• B

  $\frac{\mathrm{AB}}{\mathrm{R}}$

• C

  ABR

• D

  $\frac{{\mathrm{B}}^2\mathrm{A}}{{\mathrm{R}}^2}$