1. D. to participate in the day-to-day operations.
Let's say that you buy a stock for microsoft, it doesn't make you able to come to their offices and help them handling the customers.
2. C. the risk of bankrupt is less
when you sell your company's stock to other buyers, that buyers will also take the risk from all your company's activity because technically they own a part of your company, which make the risk of going bankrupt is less, but you surrender a part of ownership of your company
3. B. Preferred Stock
Where a company liquidates its assets, they will distribute the payment to all the holders of preferred stock first.
If there's any leftover after the company distribute the payment to preferred stock holders, than that leftover is distributed to the common stock holders
Hope this helped you out