Suppose the US interest rate is $3\%$ per annum.

The $-$$ exchange rate in spot market is $80$ and in $3-$ month forward market is $81.$ What is the per annum return on US bond in rupee terms?

A$.4\mathrm{.}25\%$

B$.8\%$

C$.1\mathrm{.}75\%$

D$.-2\%$