The word 'cheerful' would correctly complete which of the following statements?
A. Gladys looked _______ when she heard the encouraging news.
B. Jonathan participated _______ in the holiday parade.
C. George laughed _______ when his wife teased him.
D. Carolyn talked _______ about her experience.
A is the only adjective or describing situation; describing how she looked while the others use the adverb cheerfully to describe further the verb that came before it.