To create parallel structure in the sentence, which phrase would best replace the words "when plays are tragic"?
plays that are funny are more popular than when plays are tragic.
tragedy in plays
plays being tragic
plays that are tragic
in tragic plays

The answer to your question would be that to create a parallel structure in the sentence, the phrase that would replace the words "when the plays are tragic" best is the following one: Plays that are tragic.

Parallel structure, also known as parallelism, is the repetition of a grammatical construction within in a sentence. In this case, the construction repetead is the whole NP (the noun head and its modifiers: plays that are funny and plays that are tragic)

animal farm, written by george orwell, is a representation of russia after the revolution that led stalin to take over power.

in this excerpt, the central idea seems to be that the animals (a representation of society), when they believe to be working for a greater good and equality, are obedient and productive. they were convinced that, after expelling the owner (jones) from the farm, they would live in harmony and be fairly treated.

as we know, the pigs become the leaders and grow more selfish and dictatorial with time. in the end, they look and act in a way so similar to humans that it is impossible to tell the difference. the ideals of equality are shattered, and the farm turns out to be worse than it was before. the animals are manipulated with false propaganda and forced to work in order to enrich the pigs.