A dc voltage source of 12 V is connected in series with 3 resistors of 3 \( \Omega \) , 4 \( \Omega \) and 5 \( \Omega \) one by one. 3 \( \Omega \) resistor is connected with the positive side of the voltage source. An ideal diode is connected in parallel across 4 \( \Omega \) resistor with anode side in 3 \( \Omega \) resistor direction. What will be the voltage drop across 5 \( \Omega \) resistor?

A 5 V

B 7.5 V

C 0 V