He is an entrepreneur

If u have to change it in negative it will be like this:

He is not an entrepreneur.

If u have to change it in interrogative then it will be like this:

Is he an entrepreneur?

answer; (d) i believe the best answer is ; ///people said that man could not fly, but in 1903, orville and wilbur wright made the first sustained powered flight in a heavier- than-air machine;