Answer:
C: by looking at surrounding words for meaning.
Explanation:
It says "use context clues" so when you use context clues you look at the surrounding words for synonyms, antonyms, or the definition of the word. So look at the surrounding words to find the answer.
The the beginning of the Civil War, President Lincoln ordered the U.S. Navy to place a blockade along almost 3,500 miles of Atlantic Coastline. This was so the Union could stop them from importing products in and from exporting their own good out of the country. Though many smaller Confederate shops were able to get out of the ports, they only had a little bit of goods, and the South needed much more to support their economy.
He set a giant boulder at the mouth of the cave.
