I didn't select option choice B, because I read the "largest possible share of the television audience for their shows" as TV stations attempting to claim the majority of viewership.

If it was referring to the majority, the reasoning wouldn't work. TV stations could still appeal to the majority of the audience even if they alienate 10%. However, the reasoning states that they want to MAXIMIZE viewership. So, alienating that 10% would hurt that aim.

B is therefore correct.

@aidanro2003 I think the coordinating conjunction "but" carries over the noun "things" to the next dependent clause "two in particular are simplicity of expression and economy of expression."

So "two" is acting as a modifier on the word "things". The sentence would therefore read as "There are many things we value in our language[,] but two [things] are simplicity of expression and economy of expression."

Adding a noun to the dependent clause makes the sentence an independent clause. So I added a comma.

the answer key on question 4 lists "by acquiring the Louisiana purchase" as one line. Shouldn't we break up the line into acquiring and the Louisiana purchase?