Alex is working on an investment portfolio reviewing Gas and Diesel summary statistics. Which investment would be the better risk per unit, assuming Rf $=2?$

Gas: Minimum $113\mathrm{.}9,$ Maximum $125\mathrm{.}9,$ Mean $128\mathrm{.}9,$ Standard Deviation $3\mathrm{.}620927$

Diesel: Minimum $118\mathrm{.}3,$ Maximum $123\mathrm{.}4,$ Mean $119\mathrm{.}5,$ Standard Deviation $2\mathrm{.}783401$

a$-$ Diesel provides a higher Sharpe ratio with $42\mathrm{.}2145,$ thus more reward per unit of risk.

b$-$ Diesel provides a higher Sharpe ratio with $58\mathrm{.}3583,$ thus more reward per unit of risk.

c$-$ Gas provides a higher Sharpe ratio with $62\mathrm{.}6395,$ thus more reward per unit of risk.

d$-$ Gas provides a higher Sharpe ratio with $35\mathrm{.}0463,$ thus more reward per unit of risk.