Answer:
manage the business by finding new customers and investors
Step-by-step explanation:
Out of the available options, this one would be the best possible answer. But in my opinion it is not the best answer. The entrepreneur is responsible for developing a product or service that can be sold to as many customers as possible. Without the main product or service, the entrepreneur has nothing. After he/she has developed or created his product or service, then the entrepreneur must go out and find customers and investors.
For e.g. Mark Zuckerberg had to develop FB before finding investors or even having any people use it. The same applies to all time genius Steve Jobs who needed to finish the Apple 1 before it could be sold.
After the product or service is ready probably comes the hardest part which is to get enough money to get your project running and get people to use it.
All the other options are important parts of owning a business, e.g. arriving early in the morning (develops a proper work culture) or training employees, but they are not the primary responsibility.