The correct option is B 1950s and 1960s
During the 19th and early 20th centuries, Belgium’s top administrative and managerial order was filled by french speaking people. The Dutch Speaking people (Flemings) protested against the exclusion of their language and people and gradually when they gained numerical and political strength, they enforced reforms. The period between 1950s and 1960s witnessed the patch of tensions between two groups.