I believe the answer is: <span> B. preconventional
</span><span> preconventional level of morality, our standard of morality is determined by other people's standard, not something that we develop by our own.
</span>On average, most people are in <span> preconventional level when we're between 9-15 years old.</span>
I believe the answer is: increases resources available for their children.
This could even be seen in modern day mate selection. When you observe it, you would notice that men with 'high power/influence' tend to have the largest option in term of selection. This happen because high power/influence is usually correlated with ability to obtain large amount of resource (wealth/connections)
