Which of the Following Is a Correct General Description of the Reaction

Which of the following is a correct general description of the reaction that occurs in the first step of the citric acid cycle?

A) C₂ + C₄ $\rightarrow$ C₆
B) C₃ + C₃ $\rightarrow$ C₆
C) C₂ + C₂ + C₂ $\rightarrow$ C₆
D) C₄ + C₄ $\rightarrow$ C₆ + C₂