The answer might be "us" because there might be an emphasis on the word.
Answer:
<u><em>SAT Writing Tip #1: Answer questions as you read</em></u>
<u><em>SAT Writing Tip #2: Save longer questions for the end</em></u>
<u><em>SAT Writing Tip #3: Make sure your answer is both concise and relevant</em></u>
<u><em>SAT Writing Tip #4: Know your punctuation</em></u>
<u><em>SAT Writing Tip #5: Know the possible relationships between ideas</em></u>
<u><em>Focus on Using Grammar Rules to Answer the Questions</em></u>
<u><em>Use Process of Elimination to Rule Out Answers</em></u>
<u><em>Given Two Grammatically Correct Answers, Pick the More Concise One</em></u>
<u><em>Watch for Consistency Issues</em></u>
<u><em>Know that "Being" Is Almost Always Wrong.</em></u>
<u><em>Read the Passage First for Improving Paragraphs Questions</em></u>
Explanation:
Hope this helps:)
It can be used as a adjective or pronoun
The answer is D. Mitty would rather dream than attend to errands. He's not literally shooting a pistol, so B and C are not the answer. A. can't really be proved with this passage, also he specifies what biscuit he wants.
Your answer should be WHO.
Think of it like this: You wouldn't say "The boy it (a variant of 'which')", because it simply just sounds odd. Instead, you're wired to think "The boy, he (an unknown name, so it would be 'who')".