The correct option is A meristem culture
Meristem would be the most suitable for raising virus-free plants by micropropagation. A meristem is a localized group of cells, which are actively dividing and undifferentiated but ultimately give rise to permanent tissue. Although the plant is infected with the virus, yet the meristem is free of the virus. Therefore meristem can be removed and grown invitro to obtain virus-free plants.