Final answer:
The word 'sneer' from 'Ozymandias' indicates contempt on the statue's face, while 'decay' summarizes the poem's overall mood of transience and decline.
Step-by-step explanation:
In the passage from "Ozymandias", the word that indicates the face on the statue is showing contempt is C) Sneer. This specific word conveys a sense of disdain or scorn, which reflects the statue's perceived attitude. As for the word that best summarizes the overall mood of the poem, C) Decay is appropriate as it captures the inevitable decline and the transitory nature of human achievements, which is a central theme of the poem.