The correct option is A 0.01
The recombination frequency is the measure of distance between genes on the chromosomes. This is because greater the distance between the genes, higher is the crossover frequency, which in turn produces recombinants. One map unit is equal to 1% recombination frequency and is also referred as centiMorgan, i.e., 1 centimorgan = 0.01 recombination frequency. Thus, the correct option is D.