Systems theory changed the way of thinking in organizational studies; starting from 1960s, research which were undertaken within the framework of contingency theory dominated the organizational behavior field. Contingency theory, which was first termed in 1967 by Lawrence and Lorsch who investigated the effect of uncertainty and variance on organizations; represents an important part of systems approach. Within the scope of contingency theory, organizations are studied as a system. The theory focuses on both the relations of sub-systems of the organization and the relation of these sub-systems with the situations outside the organizations. Contingency theory did not totally remove the assumptions of prior approaches, but it brought a new perspective to them, which were the consideration of environmental factors and the fit of organizational factors with these external factors. The correct answer is Choice is C.