Answer:
to expose the conflict between the two feuding families
Explanation:
The play begins with the two families showcasing their feud for each other. It starts with the servants of the Capulets seeing the servants of the Montagues approaching and deciding to start a quarrel with them because their masters were quarrelling with each other.
This establishes that there was a conflict between the two families. It was also a foreboding of the tragedy that was to occur in the later part of the drama.
The answer which is an example of a theme with a dual nature is D. people who work hard learn values but may not prosper.
The other sentences are pretty linear and expected - a person works hard and is successful in life. D is somewhat different, which is why it has two natures, or a dual nature.