putting money into more than one kind of investment at a time is called\n○ liquidity.\n○ sunken cost.\n○…

Brief Explanations:

Liquidity refers to how easily an asset can be converted to cash. A sunk - cost is a cost that has already been incurred and cannot be recovered. Compound interest is the interest calculated on the initial principal and also on the accumulated interest of previous periods. Diversification is the practice of spreading investments across different assets to reduce risk, which matches the description of putting money into more than one kind of investment at a time.

Answer:

C. diversification