how can we do this problem?

26.Standard plate count was performed for quantification of bacterial cell numbers in a 500 ml liquid culture stock as given below in Figure 2. Considering the counted plates and dilution factors, what could be the most probable total cell number in the culture stock in terms of CFU (not CFU/ml!)? 1.0 mL 1.0 ml 1.0 ml 1.0 mL 10 ml 9.0 ml 9.0 mL 9.0 mL 9.0 mL 9.0 ml 0.1 ml 0.1 ml 0.1 ml 0.1 ml 0.1 ml Too numerous Too numerous 389 colonies 50 colonies 2 colonies Elguce 2. Standart Plate Count Eor. Determination of Colony Ferming Voits A) 5 x 106 CFU B) 2 x 10 CFU C) 1.95 x 10CFU D) 2.5 x 10CFU