Answer: A. and B. External benefit
C. External cost
Explanation: Since we don't know if Alison likes the music that the band plays, and we don't know if she likes to stay up late, or whether she likes to wake up early with the smell of donuts, we will assume that she will enjoy any option in what she chose. Specifically in both these cases, what she will get with the rented apartment will be <em>external benefit</em> as she will get them with the apartment for the price of a monthly rent, so the smell of donuts and music late into the night will get for free.
If her roommate does not like the late music of the neighbourhood band, and smells of donuts make her sick, then Alison will have to give up both of these apartments, which, as it says, fit into her ability to pay, so she will have to look for a third apartment that is likely to come out of the price range that she could not afford without difficulty, that is, it will have <em>external costs</em> for an apartment that is likely to be more expensive.
The ARASA, aids rights alliance of southern africa
B. Fulton's Steam Engine
Explanation:
I believe it is B because there were steamboats and steam powered trains as a result.
