Chọn khẳng định đúng?

Câu hỏi: Chọn khẳng định đúng?

A. $\frac{\text{A}}{\text{B}}-\frac{\text{C}}{\text{D}}=\frac{\text{A}-\text{C}}{\text{B}-\text{D}}$

B. $\frac{\text{A}}{\text{B}}-\frac{\text{C}}{\text{D}}=\frac{\text{AD}}{\text{BC}}$

C. $\frac{\text{A}}{\text{B}}-\frac{\text{C}}{\text{D}}=\frac{\text{A}}{\text{B}}+\frac{-\text{C}}{\text{D}}$

D. $\frac{\text{A}}{\text{B}}-\frac{\text{C}}{\text{D}}=\frac{\text{A}-\text{C}}{\text{BD}}$