If a Met^-thr^- Hfr Strain Is Mated with an F^-

If a met^-thr^- Hfr strain is mated with an F^- of genotype leu^-thi^-,prototrophic recombinants can be detected by plating the mixture on minimal:

A) medium.
B) medium supplemented with leucine and methionine.
C) medium supplemented with leucine and thiamine.
D) medium supplemented with methionine,threonine,leucine,and thiamine.
E) medium supplemented with threonine and thiamine.