Bulk breeding method was developed by

Answer: Option A

The bulk breeding method was developed by Nilson Ehle (1908).
It is a method that can handle segregating generations, in which F₂ and subsequent generations are harvested in bulk to grow the next generation. At the end of bulking period, individual plant selection and evaluation are carried out similarly to the pedigree method.
It refers to a species that is grown in bulk plots with or without selection, a part of the bulk seed is used to grow the next generation and individual plant selection is practiced in F₆ or later generation. It was first used by Nilsson Ehle in 1908.