Which is a major theme of the importance of being earnest?

a.
marriage is not to be trifled with.

b.
class status hinders personal freedom.

c.
real love is a rare and precious thing.

d.
conflict between the sexes is perennial.

The right option is B.  Class status hinders personal freedom.

The Importance of Being Earnest is a comic play by Oscar Wilde that engages themes such as marriage, class, social expectations, and the lifestyles of the English upper class. The main idea behind The Importance of Being Earnest raises is whether marriage is pleasurable or a restrictive social duty. The Importance of Being Earnest also reveals the differences between the behavior of the upper class and lower class. Members of the upper class display a great deal of pride and pretense, feeling that they are inherently entitled to their wealth and higher social position while lower class is always suppressed.

well stockyards mean a large yard containing pens and sheds, typically adjacent to a slaughterhouse, in which livestock is kept and sorted. and i'm assuming that by party you   mean a large group of people which does make sense because chicago is a very crowded place much like new york. stockyards tend to take up a lot of room due to needing the area for pens to keep animals in and the fact that stockyards are usually right by slaughterhouse where they process and distribute the product. so its much like a zoo but with some dead animal products close by.