In Example 8.3 find the price of the at-the-money call option on the three-year bond, with option

Question:

In Example 8.3 find the price of the at-the-money call option on the three-year bond, with option equal to two years.
Maturity
Maturity is the date on which the life of a transaction or financial instrument ends, after which it must either be renewed, or it will cease to exist. The term is commonly used for deposits, foreign exchange spot, and forward transactions, interest...