A voltmeter when connected across aDC supply, reads 124 V. When a series combination of the voltmeter and an unknown resistance X is connected across the supply , the meter reads 4V. If the resistance of the voltmeter is 50kΩ , the value of X is

A

1550 kΩ

B

1600 kΩ

C

1.6 kΩ

D

1.5 kΩ