Final answer:
The shift to agricultural development in Ocena around 300 CE may have been influenced by the need for a more reliable food supply, similar to cultural shifts seen in the Americas and other regions. The primary reasons for such a transition typically involve environmental, demographic, or economic changes that make agriculture a more viable subsistence strategy.
Step-by-step explanation:
The development of agriculture and the shift from hunter-gatherer societies to farming can be a complex phenomenon influenced by various factors. In the case of Ocena around 300 CE, although the exact reasons for agricultural development may not be immediately clear from the provided information, in general, changes in subsistence strategies often occurred in response to environmental changes, population pressures, or the discovery of more efficient ways to produce food. For example, agriculture began to take hold in the Americas as of the third century BCE, where after thousands of years of hunting and gathering, people started to form agricultural-based societies. Likewise, the decision to take on agriculture in Ocena could be influenced by recognition of the potential for a more reliable food supply, as hinted at by the experiences of people in other regions such as the archipelago, where a steady food supply eventually came from grains like rice.