Assuming an investment provided an HPR of $8\mathrm{.}5\%$ and the $E(r)$ was at $10\mathrm{.}5\%,$ what is the amount of uncertainty?

a$.-2\mathrm{.}0\%$

b$.$ None of these is correct.

c$.19\mathrm{.}0\%$

d$.2\mathrm{.}0\%$