A bill can be either , meaning that its contents and the discussion surrounding it are open to anyone, or , meaning that most discussions about the bill take place behind closed doors and are not widely known. A.
censored . . . open
B.
hidden . . . private
C.
public . . . private
D.
public . . . exposed

Let's first tackle the first blank space: if a bill is open to discussion for everyone, it's not censored or hidden, but it's public! So now we only need to consider options c) and d)..

The second blank talks of a bill that is discussed behind closed doors - so it's not "exposed" , but rather private - the correct answer is c)

Explanation:

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.