Which of the following estate will most likely have the greatest liquidity problem?

An estate with $14,000,000 of marketable securities.

An estate comprised of rental real estate and marketable securities totaling $12,000,000.

An estate consisting of a closely held business interest valued at $13,000,000, marketable securities of $800,000 and $900,000 of cash.

An estate comprised of a closely held business interest valued at $14,000,000 and cash of $100,000.