Complete the sentence with the correct option.
The teacher added the stipulation that all projects had to be _______; no student could carry out research on an area that had already been explored by someone else.
According to the given context, no student should carry out research on an area that had already been covered by someone else. Therefore, it should be something new and original. Among the given options, 'original' is the most appropriate word.
Answer is option A.
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