Answer:
Step-by-step explanation:
The second half of the Zhou dynasty was the first time when China's history started to be recorded. People began to ponder over past events and form their own ideas about everything. This was also the first time when people waged violent wars against each other in China and wondered what could be done to avoid being killed. The afterthought of past events and outlook on future life forced people to think hard. Hence it was no wonder philosophers appeared.