______ is one of the factors that tend to promote social change.

A．two different societies
B．the necessity of social change
C．certain factors that determine the ease with which social changes occur
D．certain factors that promote social change

A．Social change tends to meet with more difficulty in basic and emotional aspects of society.
B．Disagreement with and argument about conditions tends to slow down social change.
C．Social change is more likely to occur in the material aspect of society.
D．Social change is less likely to occur in what people learned when they were young.