The correct answer is C.
To determine the tone of a text, you have to look at the word choices of the text and see what effect they have on the text
It is dark because Barnardo has trouble seeing the other guard.
- - C.<span>He; subject
This is because if "X and Harold" are the subjects, and to complete this using "he", it would also have to be a subject.
He and Harold </span><span>are going on a camping trip next month.</span>
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to remind readers that they must take action immediately to succeed against the British</span>