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C. Is the fragment you are looking for.
The Library of Congress Prints & Photographs Division has extensive holdings of World War I era posters. Available online are approximately 1,900 posters created between 1914 and 1920. Most relate directly to the war, but some German posters date from the post-war period and illustrate events such as the rise of Bolshevism and Communism, the 1919 General Assembly election and various plebiscites.
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Answer:</h3>
Adjective clause
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Explanation:</h3>
An <u>Adjective clause </u>,also known as a <u>Adjectival clause,</u>is a type of dependent clause that works to describe a noun in a sentence.
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Example:</h3>
The following sentences are examples
<em>Wrong- </em>the article <u>Witch</u> he wrote it was well researched
<em>Right- </em>the article <u>Witch</u> he wrote was well researched
Two pronouns are used in the adjective clause
Hope this helps
Being a threat is the proper answer