某投资方案折现率为18%时，净现值为-3.17万元，折现率为16%时，净现值为6.12万元，则该方案的内含报到率为(A.16%+(0-3.17)(6.12-3.17)X(18%-16%%)=13.85%B.16%%+(0+3.17(6.12+3.17)X(18%%-16%%)=16.68%C.16%+(6.12-0)(6.12+3.17)x(18%-16%)=17.32%D.16%+(0+3.17 )/(6.12-3.17)x(18%-16%)=18.15%