The correct answer is A. Quantitative analysis method.
Quantitative analysis is a method of analysis that uses mathematical and statistical techniques to solve problems. It is often used in business and economics to make decisions about how to allocate resources.
In cost analysis, quantitative analysis is used to fit a cost function to past data observations. This allows businesses to predict future costs and make more informed decisions about how to allocate resources.
Qualitative analysis is a method of analysis that uses non-numerical techniques to solve problems. It is often used in social sciences and humanities to understand human behavior.
Account analysis is a method of cost analysis that focuses on individual accounts. It is often used to identify cost drivers and to allocate costs to products or services.
Conference analysis is a method of cost analysis that involves a group of people discussing and analyzing costs. It is often used to get a consensus on cost estimates.