Explanation on how to answer:
Read the story and figure out whats missing. Without the whole story, no one can tell you what important part is missing. Find the section that that excerpt is from and see what the differences are, or post the full story.
1) 9+9+9=27
<span>2) 8+9+10=27 </span>
<span>3) 7+9+11=27 </span>
<span>4) 6+9+12=27 </span>
<span>5)3^2+3^2+3^2=27 </span>
<span>6) 5+9+13=27 and so on.</span>
The main idea doesn't explain in detail why it is the main idea. It doesn't prove that it is the main idea, it only states so.
Answer:
B. To introduce the reader to what the essay will be about
