Concept:Cocoa swollen shoot virus is spread by a sap-sucking insect that feeds on cocoa plants.Explanation:The main vector of cocoa swollen shoot virus is the mealybug.Mealybugs transmit the virus when they feed on the sap of infected cocoa trees and then move to healthy trees.Stem borer, white fly, and capsid are not the primary vectors of this disease.Answer:B. Mealybug