The concept of center of origin of crop plants was proposed by

Answer: Option B

The concept of the center of origin of crop plants was proposed by N. I. Vavilov.
A center of origin is a geographical area where a group of organisms, either domesticated or wild, first developed their distinctive properties. They are also considered centers of diversity.
Centers of origin were first identified in 1924 by Nikolai Vavilov.
A Vavilov Center (of Diversity) is a region of the world first indicated by Nikolai Vavilov to be an original center for the domestication of plants.