Which one of the following plants undergoes self-pollination?

Which one of the following plants undergoes self-pollination?

مندرجہ ذیل میں سے کون سا پودوں میں سے کون سا خود جرگن سے گزرتا ہے؟
Explanation

Self-pollination occurs when pollen from the same flower fertilizes the ovule, common in bisexual flowers like rose.

Maize, papaya, and cotton mainly undergo cross-pollination due to separate male and female parts or flower arrangements.