Discuss social criticism in The Canterbury Tales.What kind of social criticism is shown in this book because I know there is supposed to be some,...

The most prominent social criticism in Chaucer's
The Canterbury Tales is targeted at the church and its
leaders.

In "The Prologue," for instance, the friar
arranges marriages for women that he has impregnated.  The naive narrator presents this
as if it is a good thing--the friar takes care of his people kind of thing.  But of
course, it's not a good thing.  The reader understands
this. 

Religious figures are, for the most part, presented
as corrupt, greedy, arrogant, prideful.  They are confidence, or con
men.

"The Pardoner's Tale," for another example, reveals
how the pardoner blatantly uses a story about greed to fulfill his own greed.  The
pardoner is very up front about the fact that he is just out to separate his listeners
from their money. 

When analyzing in search of social
criticism, remember that Chaucer uses irony here.  He uses the merry, naive narrator to
present characters in what seems to be a positive light.  The reader should understand,
though, that some of the characters are not positive at all.  Just because the
unreliable narrator is gullible and accepts people as they are, doesn't mean the reader
has to.