Assessing Bond Features in Rising Interest Rates

Consider a fixed income security with the following features:

- It has a face value of $1,000.

- It pays interest annually at a stated coupon rate of 5%.

- The issuer has the option to call the bond after 5 years at a price of $1,050.

- The bond matures in 10 years.

- The bond is not convertible into equity.

Which of the following features should an investor consider the most important when assessing this bond's attractiveness, especially in a rising interest rate environment?