which line supports the theme that the customs of "civilized" society are confining and intolerable. The Adventures of Tom Sawyer

"he had to talk so properly that speech was become insipid in his mouth"

Explanation:

This is the only detail/option that states how being "civilized" is not all it's cracked up to be.  The definition of "insipid" is "lacking flavor."  If Huck Finn is made to speak properly, he loses his boyish, informal manner of speaking.  This detail supports the theory that becoming a proper young man is stifling, confining, and intolerable.

the anecdote makes readers feel sorry for the man’s lack of heritage, then reminds readers that the man has an equally valuable heritage.

wheres the following authors?