The time period assumption:
a. Recognizes that a company can divide its business activities and transactions into shorter periods, such as a year or less, and still provide useful financial statements
b. Requires that financial statements cover a period of at least one year to be useful
c. Requires that companies use a calendar year (January 1-December 31) for financial statement reporting purposes
d. Requires that reporting periods must be of sufficient length that no judgments or estimates are built into the financial statements