The following are the answer to your question and please next time to post it one by one to make the question clear and easy to answer
#1. A. the president of historical society
#2. B. Star wars
#3. B. my youngest cousin
#4. D. Maria
#5. B. my classmate
#6 <span>A.the fourth largest city in the United States; renames Houston
#7 </span><span>B.Star Wars; renames movie
#8 </span><span>A.The inventor Thomas Edison developed many devices that changed the modern world.
</span>#9 <span>C.The Johnsons' golden retriever Shep likes to fetch tennis and golf balls.
</span>#10 <span> A.My two friends Katie, and Sarah are spending the weekend at my house</span>
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I would say the correct answer is the unity of a paragraph. The unity is the relevance of the sentences in a paragraph to the topic sentence.
An adjective clause is a dependent clause that, like adjective which modifies a noun or pronoun. Adjective clauses begin with words such as that, when ,where, who, whom, which, and why...... hope that helps!!!