The correct option is B 2 pair and 1 pair
Mendelian dihybrid is an organism which is heterozygous at two different genetic loci and hence involves two pairs of chromosomes. A dihybrid with linkage refers to two pairs of genes which are present on similar homologous chromosome. Thus, mendelian dihybrid and dihybrid with linkage are respectively related with 2 pair and 1 pair chromosomes. Option B is correct.