Final answer:
Sarcasm in Charles Dickens's writing, such as in 'Oliver Twist,' manifests as descriptions or dialogues that convey contempt through irony, contrasting harsh realities with genteel views. One would look for mocking tones or absurd contrasts between a character's actions and their descriptions.
Step-by-step explanation:
To identify parts of an excerpt from Oliver Twist by Charles Dickens that indicate sarcasm, one would look for phrases or descriptions that convey the opposite of what is meant, typically to mock or convey contempt. Sarcasm in Dickens's work often highlights the discrepancy between the harsh realities of the industrial age and the genteel or romanticized views of his time.
An example of sarcasm in Oliver Twist could be the depiction of criminal characters in a way that absurdly contrasts with their actions, such as referring to a brutally violent character in overly polite terms, or describing the grim realities of poverty in a way that seems to mock the cheerful, optimistic views held by some people of that era.
As the provided excerpt itself is missing, this guidance is based on common traits of Dickens's satirical style as represented in his body of work, which includes vivid descriptions of setting, ironic observations of society, and careful examination of social inequalities without overt moralizing.