An investor purchases an annual paybond with a 2.55 % coupon rate and exactly 14years remaining until maturity at a price equal to par value. The investors investment horizon is 13.5 years. The approximate modified duration of the bond is 13.130 years. The duration gap at the time of purchase isclosestto:

a.1.071

b.-.0352

c..0155

Explain how you got there excel