Answer:
C. sell your 10 year bonds and buy an additional $100,000 of the 1 year bonds and expect a capital gain
Explanation:
If you expect a decrease in the interest rate it means that each bond that you hold today will have a higher price tommorrow because of the decline in the interest rates.
It occurs because bond coupons are fixed and if market expectations are lower interest rates, then the adjustment occurs in the bond price to make the adjustments to a lower bond's yield.