As a bond fund manager, you are considering corporate bonds issued by Changing Universe $($CU$).$ Each CU bond is a $4-$year bond with a par value of $$1$ million. Its interest payments are based on the following schedule: $$40,000$ in year $1,$$$60,000$ in year $2,$$$80,000$ in year $3,$ and $$100,000$ in year $4.$ You estimate CU's current interest rate is $8\%.$One year later, the yield declines to $7\%,$ and you decide to sell your bond. What is your holding period return?

A$.6\mathrm{.}6\%$

B$.10\mathrm{.}8\%$

C$.4\mathrm{.}3\%$

D$.8\mathrm{.}5\%$