Out of these option it is Bitcoin that can easly generate the biggest profits. You just buy and hold it and expect huge return in the near future.
The downside of BTC is is potential instability and volatility, while price is constantly growing it can be hindered by negative news or legal restrictions

The safest option from your list is Real Estate Market, but it is not for everyone, you need to be already rich to be able to purchase a property.

Gold, bonds - not worth the time, profit is only good to kill inflation rate.