Dr . Waksal and his father and daughter were found guilty of insider trading because _ _ _ _ . a ) they told Martha Stewart to sell ImClone's stock because price will likely drop the next day. b ) they received a tip from their stockholder that ImClone's stock price will drop the next day, and traded on that information. c ) they profited from trading ImClone's stock. c ) they traded ImClone's stock based on private information that would cause a sharp decline in the stock price