To make sure the reader remembers the point of your essay the most important is the introduction also known as the theme
Here, We need to Organize the information of our research so, we should classify them into categories.
In short, Your Answer would be Option B
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The correct sentence is option two:
There have been many accidents during airshows; for example, last year the wind toppled a tent and equipment on top of bystanders.
The semicolon is a punctuation mark which indicates a pause, usually between two clauses that are not joined by a coordinating conjunction. Semicolons can also replace commas to separate elements in a list that already includes commas.
In the example sentence, the semicolon separates two clauses. Besides, a comma follows the introductory phrase "for example" because it introduces a clause.
