The answer is c.-architectural talent and an eye for design.
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We know, Voltage drop = Voltage * Resistor / total resistance
Here, voltage = 75 V
Resistor for cal. = 10 Ohm
Total resistance = 10 + 15 = 25 Ohm
Substitute their values,
e = 75 * 10/25
e = 3 * 10
e = 30 V
In short, Your Answer would be Option B
Hope this helps!