Answer:
C. It made steel cheaper.
Explanation
There can be several right answers for this blank. The following are a couple words that can correctly fill the space.
1) John McCain was a Republican at the time of the 2008 election- He was the Republican party's nominee for President with his running mate being Sarah Palin.
2) John McCain was a Senator at the time of the 2008 election- He was a Senator representing the state of Arizona in the US Congress before starting his run for the presidency.
The best option fro the list would be that "<span>A. Both eras were strongly influenced by civilization that became "superpowers," since during the Classical Era this was mostly Greece and Roma, while in the Modern era it would be the United States and Russia. </span>