Which of the following statements regarding differential cost accounting is most correct? Choose only one answer.

Group of answer choices

A. Differential cost accounting focuses solely on classifying fixed versus variable costs.

B. Differential cost accounting is used primarily for long-term pricing decisions.

C. In differential cost accounting, a key factor in decision-making is understanding whether or not costs will change under different alternatives.

D. In an add/drop decision using differential cost accounting data, a negative net income (revenue minus all costs) ALWAYS means a product or service should NOT be expanded.

E. In a differential cost accounting analysis, fixed costs can ALWAYS be ignored.