Assume that you are considering a portfolio of two assets, A and B$,$ with $40\%$ invested in asset A

and invested $60\%$ in asset $B.$ Assume also that the assets have the following statistics:

a$.$ Variance $=0\mathrm{.}0480$

b$.$ Variance $=0\mathrm{.}0632$

c$.$ Variance $=0\mathrm{.}0656$

d$.$ Variance $=0\mathrm{.}0728$

Answer: B$*****$ Please explain in as much detail as possible to arrive to the answer.