Answer:
The correct answer is Great wall of China.
Step-by-step explanation:
Remember that nouns are the class of words that give names or identify all the things we know. There are many types of nouns, including proper nouns.
Proper nouns designate specific people or places.
Out of context, a proper noun can refer to more than one person or place, but in context, speakers and listeners (or writers and readers) know what person or place they are referring to.
Also, these types of nouns are always capitalized.
Examples of proper nouns: Laura, Argentina, Great wall of China.