The centroid method is a variance method of hierarchical clustering in which the distance between two clusters is the distance between their centroids (means for all the variables)

The time period assumption states that

A. a transaction can only affect one period of time B. estimates should not be made if a transaction affects more than one time period. C. adjustments to the enterprise's accounts can only be made in the time period when the business terminates its operations D. the economic life of a business can be divided into artificial time periods

Land that had been held as an investment was sold and a gain was recognized

a. as a component of operating income b. as a non-operating income item (other income or expense) c. as a discontinued operation d. as an item of other comprehensive income