The correct option is C 0.6volt
In a serially connected circuit the voltage across is directly proportional to the resistance in the circuit. That is, V∝R.
So, VVtotal=RRtotal
The total resistance R in the circuit is R=2+3+5=10 ohm.
Since, the resistance of the 3 ohms resistor is only three tenth of the total resistance, the applied voltage is given as 310×2= 0.6 volt
Hence, the potential difference between the terminals of 3 ohm resistance will be 0.6 volt.