A 35 V dc supply is connected across a resistance of 600 ohm in series with an unknown resistance R. A voltmeter having a resistance of 1.2 k Ω is connected across 600 ohm resistances and reads 5 V. The value of resistance R shall be:

A

1.2 Ω

B

2.4 Ω

C

120 Ω

D

400 Ω