$A$ $2 \text{ V}$ battery is connected to a diode in forward bias. $A$ voltage of $0.5 \text{ V}$ is dropped across the diode,which is independent of the current flowing through it. $A$ current greater than $10 \text{ mA}$ causes excessive heating and damages the diode. If a current of $5 \text{ mA}$ is required in the diode,what value of series resistance must be connected in the circuit?

• A
  $3 \text{ k}\Omega$
• B
  $300 \text{ k}\Omega$
• C
  $300 \Omega$
• D
  $200 \text{ k}\Omega$