Primitive cultivars that are selected and cultivated by famers for many years are

Answer: Option A

Primitive cultivars that are selected and cultivated by famers for many years are Landraces.
Landraces are defined as dynamic populations of a cultivated plant with a historical origin, and distinct identity, often genetically diverse and locally adapted and associated with a set of farmers' practices of seed selection and field management as well as with a farmers knowledge base.
A landrace is a dynamic population of a cultivated plant that has historical origin, distinct identity and lacks formal crop improvement, as well as often being genetically diverse, locally adapted and associated with traditional farming systems.