Answer:
a. Reveal changes in the relative importance of each financial statement item to a base amount.
Step-by-step explanation:
Common size statement analysis is a ratio analysis of financial statements. It shows a standard base figure relative to its all items as a percentage. For example, in an income statement, service, or revenue is the base figure, so we have used like 100%. Then we go one by one and check those items relative importance to that sales or revenues. Therefore, option "A" is the correct answer.