What are the most likely reasons a ya corporation would open a factory in china?

There are a myriad of reasons why a factory owner would choose to open a factory in China.

At its base, economics requires one to control costs while charging the highest price that the market will allow for a product.

And so, if 1. the costs of production are lower in China or 2. the consumer is in China, it can be advantageous to create a product in China to be sold in China or elsewhere.

well 1 they have there leader that controls them