Look again at the valuation in Table $22\mathrm{.}2$ of the option to invest in

the Mark II project. Consider a change in each of the following inputs. Would the change

increase or decrease the value of the expansion option?

a$.$ Increased uncertainty $($higher standard deviation$).$

b$.$ More optimistic forecast $($higher expected value$)$ of the Mark II in $1985.$

c$.$ Increase in the required investment in $1985.$