History interests me. I decided to read the Declaration of Independence.
Explanation:
Sentence variety refers to the reduction of repetition in a text. What's also important is that it adds emphasis to important points in the text.
The first two options are somewhat repetitive as they begin with the same subject - <em>I</em>. The second option is additionally incorrect because there's a change in meaning compared to the original sentences.
The last two options are better because the reduction of repetition is present. Instead of<em> I</em>, the subject in the first sentence is <em>history</em>. The fourth option is not the best because the second sentence is redundant. That leaves us with the third option as the best one.
