In the sentence: <span>Long ago, builders erected the Great Wall of China to keep out invaders, in which the underlined word is the "Great Wall of China", it specifies the direct object.
</span>Direct objects<span> can be nouns, pronouns, phrases, or clauses. If you can identify the subject and verb in a sentence, then finding the </span>direct object<span>—if one exists—is easy.</span>
I would say B-correct (By carefully organizing your thoughts) and putting your writing into organizing i know when i have it like that its way more easy for me to understand what your trying explain to the other reader
C. Surroundings would be your answer. Heights can also be an answer, but they want the exact more direct answer, so C.
Hope this helps.
Lights, your answer might be lights