A_three_phase_transmission_line_is_having_a_three_unit_suspension_insulation_string._The_voltage_at_the_insulator_unit_nearest_to_the_line_is_20kV_and_that_across_the_adjacent_unit_is_15_kV._The_ratio_of_mutual_to_ground_capacitance_is_________________$

• A. 0.18
• B. 0.2
• C. 0.333
• D. 0.16