JEE Main 2019 Physics question

A moving coil galvanometer has resistance 50 Ω and it indicates full deflection at 4 mA current. A voltmeter is made using this galvanometer and a 5 kΩ resistance. The maximum voltage, that can be measured using this voltmeter, will be close to:

• (A)40 V
• (B)10 V
• (C)15 V
• (D)20 VCorrect