A company that is unable to pay its debts as and when due is said to be
A. Bankrupt
B. Bad
C. Illiquid
D. Insolvent
E. Undercapitalised

D. Insolvent

Explanation:
A company is considered insolvent when it cannot meet its financial obligations as they become due. This condition may lead to bankruptcy if the company is unable to resolve its debts.