Diffusion current in a p – n junction is greater than the drift current in magnitude 
 

• Because diffusion current is dependent on charge density, it will grow in the case of forward bias as the corresponding charge densities on the two sides increase. 
• Because the junction charge density will be lower and there will be a lower electric field in the opposite direction, the drift current will be lower (due to positive external voltage).

Hence the correct answer is if the junction is forward – biased .