Final answer:
To make sentence 4 more engaging, we could use: 'Chaucer's pilgrims form such a heterogeneous group and include representative medieval social classes. However, they are also presented as real people with real biographies.'
Step-by-step explanation:
To revise sentence 4 of Geoffrey Chaucer's The Canterbury Tales Prologue for a more engaging effect, we could choose option (c): "Chaucer's pilgrims form such a heterogeneous group and include representative medieval social classes. However, they are also presented as real people with real biographies."
Chaucer's pilgrims form such a heterogeneous group that includes representative medieval social classes. However, they are also presented as real people with real biographies, which adds depth to their characterization and makes them relatable to the readers.
This option maintains the complexity of the original sentence while injecting a contrasting conjunction that heightens the tension between the general representation of the classes and the individuality of the pilgrims. It also allows the statement to flow smoothly, keeping the sentence both informative and engaging.