Answer:
It is either B or C. C has a higher chance. You don't have to listen to me. If his face turns from smiling and then let the smile fade, it is most likely he is afraid or suprise.
Explanation:
Parallelism means giving two or more parts of one or more sentences a similar form to create a definite pattern, a concept and method closely related to the grammatical idea of parallel construction or structure, which can also be called parallelism.