Two converging lenses are identical in shape, i$.$e$.$ they have the same two radii of curvature, $R_1$ and $R_2,$ but they are made from different materials. Lens $A$ is made from a material with refractive index $1\mathrm{.}74,$ lens $B$ from a material with refractive index $n.$ Lens A is used in a magnifying glass with maximal angular magnification $2\mathrm{.}25.$ Lens B is used in a magnifying glass with minimal angular magnification $1\mathrm{.}15.$ What is the refractive index $n$ of lens $B?($Assume that the near point is at $d=25cm.)$

A$)1\mathrm{.}52$

B$)1\mathrm{.}60$

C$)1\mathrm{.}68$

D$)1\mathrm{.}80$

E$)1\mathrm{.}89$