A thin made of glass of refractive index `1.5` has a front surface `+11 D` power and back surface `-6D` . If this lens is submerged in a liquid of refractive index `1.6`, the resulting power of the lens is
A. `-0.5 D`
B. `+0.5 D`
C. `-0.625 D`
D. `+0.625D`