The key types of business decisions can be classified as management, marketing, and: A. accounting. B. production. C. inventory. D. finance. E. information systems.

The key types of business decisions can be classified into three main categories: management, marketing, and finance.

A. Accounting: This is not a type of business decision, but rather a method of tracking, summarizing, and analyzing the financial transactions of a business.

B. Production: This is a part of business operations, but not a type of decision. Decisions related to production are usually categorized under management decisions.

C. Inventory: Similar to production, inventory is a part of business operations. Decisions related to inventory are usually categorized under management decisions.

D. Finance: This is a key type of business decision. Financial decisions involve how a business raises, allocates, and uses funds.

E. Information Systems: While information systems are crucial to modern businesses, they are not a type of business decision. Decisions related to information systems could fall under management or marketing decisions, depending on the specific context.

So, the answer is D. Finance.