The soviet and chinese helped korean communists gain power in the north
The correct answer is letter D.
Preparedness if often linked to the concept of learned helplessness. This is the common adaptive behavior of humans or organisms to certain experiences that have happened before. Usually it is a repeated painful stimuli that an organism has endured many times, which then when presented again, enables the organism to escape or avoid the situation. In essence, the stimulus is familiar, hence, the organism learns how to prepare for the outcome or consequence.
It means that the contribution of someone that give their all to a certain effort often much more valuable compared to half-meaning efforts that given by more than one individuals.
This view often implemented in jobs such as programming and accounting, when more than one perspective could alter the final outcome of the works done.