To Determine Whether a Substantial Portion of a Firm's Operations

To determine whether a substantial portion of a firm's operations are explained by its segment information, the combined revenue from sales to unaffiliated customers of all reportable segments must constitute at least:

A) 10% of the combined revenue of all operating segments.
B) 75% of the combined revenue of all operating segments.
C) 10% of the combined revenue from sales to unaffiliated customers of all operating segments.
D) 75% of the combined revenue from sales to unaffiliated customers of all operating segments.