The correct option is D
Potato
Emasculation refers to the process of removal of anthers from the bisexual flowers. This process is carried out as a part of various plant hybridization techniques wherein plant breeders pollinate the bisexual flowers with pollen grains to get desired varieties. This process has no validity in the case of plants with unisexual flowers.
Potato plant require this step of emasculation, however plants like papaya, spinach, and mulberry do not require this step, because potato is a monoecious plant and papaya, spinach and mulberry are dioecious. However, for all these flowers bagging is required to avoid undesired pollination because of insects or air.