Solution:
\textbf{Single choice :} For the reaction : $A + B \to C$\\
Which one of the following best describes the data in the above figure?\\
$(A)$ Specie $C$ could be adsorbed on the surface.\\
$(B)$ The reaction could be reversible.\\
$(C)$ Both the above statements could be true.\\
$(D)$ Neither $A$ or $B$ are on the surface.\\
$(E)$ None of the above could be true.
