In a Transformation Experiment in the Bacterium Streptococcus, the Donor

In a transformation experiment in the bacterium Streptococcus, the donor has the genotype d⁺e⁺f⁺ (order is not known) . The recipient strain is d^-e^-f^- and f⁺ transformants are selected for. The complete genotype is determined for each of the f⁺ transformants and the results are shown below. What is the cotransformation frequency between f and e? $\begin{array} { l c } Genotype&Number~ of ~transformants\\\\a ^ { + } e ^ { + } f ^ { + } & 25 \\ a ^ { + } e ^ { - f ^ { + } } & 4 \\ a ^ { - } e ^ { + } f ^ { + } & 80 \\ a ^ { - } e ^ { - } f ^ { + } & 256 \end{array}$

A) 28.8%
B) 71.2%
C) 7.9%
D) 23.0%
E) 40.6%