I believe the answer is: strong, stern, and assertive.
The speech above is specifically made to address woman issue that arise in 1848, when women were openly discriminated against the society.
To gained reader's support on serious issue like this, it is important to use strong, stern, and assertive tone. This could be seen on the monotone statements and formal language that issued in the speech
Lady Capulet is to tell Juliet about the "good news".
A scientific article on the benefits of community service is the correct answer :) All the others are irrelevant or too old.