Explanation

(c) When $p$-end of p-n junction is connected to positive terminal of battery and $n$-end to negative terminal of battery, then p-n junction is said to be in forward bias. In forward bias, the more numbers of electrons go from $n$-region to $p$-region and more number of holes go from $p$-region to$\ n$-region. Therefore, major current due to both types of carriers takes place through the junction causing, more recombination of electron hole pairs thus causing reduction in height of depletion region and barrier potential.