Which sentence correctly uses a comma to separate the introductory phrase?
a) the library of congress is the largest library in the world, because it contains more than 147 million items.
b) the largest library in the world is the library of congress, which contains more than 147 million items.
c) the library of congress, which is the largest library in the world, houses over 147 million items.
d) containing more than 147 million items, the library of congress is the largest library in the world.

*** the correct answer is d. just those that want to know***

post the picture, without it i cant answer it. : )

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.