Galt Industries has just issued a callable, $1000 par value, five-year, 6% coupon bond with semiannual coupon payments. The bond can be called at par in three years or anytime thereafter on a coupon payment date. If the bond is currently trading for $978.94, then its yield to call is closest to :

a. 6.0%

b. 3.4%

c. 6.5%

d. 6.8%