Final answer:
The amount included in the short-term investments account is $31,000 in U.S. Treasury bills purchased in May and maturing in July, 2024.
Step-by-step explanation:
The amount included in the short-term investments account is option 4) $31,000 in U.S. Treasury bills purchased in May and maturing in July, 2024.If the short-term investments account only mentions an amount of $31,000 without specifying the nature of the investment, then option 1) $31,000 would be the correct answer. If additional details about the investment are given, such as it being in U.S. Treasury bills or purchased in May and maturing in July 2024, then the correct answer would be the corresponding option.