Among the choices, closed-end mutual funds generally provide the highest liquidity because their shares typically trade on an exchange in the secondary market, allowing investors to buy or sell during market hours at the prevailing market price. That exchange trading feature gives investors a practical “exit” mechanism that is often much more accessible than the redemption limitations found in private pooled vehicles. Therefore, C is correct.

Hedge funds (choice A) are commonly subject to lock-up periods, limited redemption windows (monthly/quarterly), and other restrictions such as gates, so investors often cannot access their money on demand. Private equity funds (choice B) are typically among the least liquid investments, as capital is committed for long periods (often years), with distributions occurring as investments are sold; early exit may be difficult or only possible through limited secondary markets at a discount. Distressed securities funds (choice D) can also be illiquid because the underlying holdings may be thinly traded, complex, or subject to restructuring processes, and such funds may impose additional redemption restrictions depending on structure.

A key SIE point: “liquidity” is not only about the underlying portfolio but also about the investor’s ability to sell or redeem the investment. Closed-end funds offer a market-traded mechanism that generally provides more immediate liquidity than private funds, even though closed-end funds can trade at discounts/premiums and may have varying trading volumes. Still, compared with hedge funds/private equity, closed-end fund shares are typically the most liquid option listed.