The correct answer is letter D: Diversified mutual fund - Treasury bond - stock.
These orders of investments ensure a systematic low to high risk possibilities. A company needs to look into possible options where it can invest its assets in the form of a diversified mutual fund. Upon doing this, securing a bond from the state is wise investment in case loans are too high or the company comes to debts. The last risk would be engaging in stocks or the deliberation of this to several company owners.