Which of the Following Represents a Synthesis Reaction?
A)AB $\rarr$ A + B
B)A + B

Which of the following represents a synthesis reaction?

A) AB $\rarr$ A + B
B) A + B $\rarr$ AB
C) AB + XY $\rarr$ AX + BY
D) AB + XY $\leftrightarrow$ AX + BY
E) None of the choices are correct.