$4.$ Given the following expected returns and standard deviations of assets B$,$ M$,$ Q$,$ and D$,$ which asset should the prudent financial manager select? $($Justify your choice to earn the allotted points$)$

Asset Expected Return Standard Deviation

B $10\%5\%$

M $16\%10\%$

Q $14\%9\%$

D $12\%8\%$

a$.$ Asset B

b$.$ Asset M

c$.$ Asset Q

d$.$ Asset D