The correct answer is: Unit costing.
Unit costing is a cost accounting method that assigns costs to individual units of product or service. It is a simple and straightforward method that can be used to track the costs of a wide variety of products and services.
Process costing is a cost accounting method that assigns costs to production processes. It is used in industries that produce large quantities of homogeneous products, such as chemicals and petroleum products.
Contract costing is a cost accounting method that assigns costs to individual contracts. It is used in industries that undertake long-term projects, such as construction and engineering.
Uniform costing is a cost accounting method that assigns costs to products or services using a single set of cost accounting procedures. It is used in industries that produce a variety of products or services, such as manufacturing and retail.
Unit costing is the most appropriate cost accounting method for the question because it is the simplest and most straightforward method. It can be used to track the costs of a wide variety of products and services, and it is not specific to any particular industry.