The answer is C) The country had a low population density and lacked any defense system.
The ease with which European imperialists conquered China was due to its sparse population and absence of defense mechanisms.
During that time, China did not possess a formal or adequately trained military.
These aspects made it easier for invaders to penetrate Chinese lands, despite the challenging geography which included mountainous regions that had kept China isolated for many years. The Mongols invaded and controlled significant parts of China in the 1120s AD, and another instance of invasion was the Japanese occupation between 1937 and 1945.
According to the process theory of motivation, individuals generally exhibit motivation through a sequence of psychological and behavioral actions that are influenced by their particular needs shaped by their lifestyle. In Megan's situation, it is likely that she will feel a strong drive to exert additional effort to achieve a goal of enrolling twice as many new members in her part-time job compared to her usual weekly performance. This motivation stems from the appealing reward she stands to gain, especially considering her responsibilities as a mother to multiple children. To reach her target, she may opt to increase her work hours during that week, which would require a greater effort, but ultimately, the outcome would be quite beneficial.