Answer:
The answer is C. dividends paid minus net new equity raised.
Explanation:
Cash flow to stockholder is the amount of money a firm pays its equity holders(shareholders). To get the cash flow to stockholder, dividend paid is subtracted from new equity raised (i.e Dividends - new equity raised).
Note that if Dividend are paid in form of stock(stock Dividend), this is not treated as cash flow to stockholders because it is non cash transactions.