Shady Corporation's Executives Are Concerned Over the Firm's Steadily Declining

Shady Corporation's executives are concerned over the firm's steadily declining stock price and decide to do something about it. They each decide to make significantly large purchases of their firm's stock in order to stabilize and hopefully even to drive up its price, reasoning that they can sell the stock for the higher price down the road and profit from the transaction. You are a broker-dealer for the firm's executives. Are Shady's executives planning to do anything illegal?

A) No. It's a win-win. They are using their own money to buy stock of their firm, and this can help drive the stock price up and put profits in their pockets.
B) Yes. To purchase shares of their own company is considered to be illegal insider trading.
C) No. As long as they follow the rules and report their purchases to the SEC, it is not illegal for them to purchase shares of their firm's stock.
D) Yes. Although it is not illegal for them to purchase shares of their firm's stock, they cannot do so in order to try to manipulate the price of the stock.