Answer:
a fortified boundary line running through dense populations
Explanation: :()
"<span>c. Its proximity to Africa and India made trade quite successful" is the best option, since a great deal of trade during this time and indeed today is done with ships. </span>
<u><em>The Mir Space Station was in orbit for an astonishing 15 years, being the first modular space station public ally known!</em></u>
The Mir Station is no longer in orbit and was destroyed upon forced reentry by the Russians in an attempt to get rid of it, so it is NOT A.
Does the word "Mir" sound American to you? Well I certainly hope not, because it isn't, so it is NOT C.
If it isn't A, and it isn't C, it can't be all of the above, so it is NOT D.
So the answer is B by process of elimination!
