(a)The feature indicated here is 'Control'. The right to run the business; make all the decisions lies absolutely with the sole proprietor. He need not take consent of any one else while taking decisions. He solely control his business.
(b)The feature shown in the sentence is 'Sole risk bearer and the profit recipient, As the soleproprietor is the only owner of the business, therefore the risk of failure of business or profit earned by successfuly running the bussines are enjoyed by him all alone.