I don't know why more people are choosing "NO".

You can see here
http://fiatleak.com/major bitcoin transaction do in China, i know no one can control the bitcoin, but China has a lot bitcoin users, although can not control the bitcoin but still can control the market.
maybe the current price is controlled by China ?
we don't know.

You just said it yourself, no one can control bitcoin. Maybe China is currently influencing the price of bitcoin more so than other countries, but that in no way means what people imply when you say "China controls bitcoin".