There is not a multiple choice
Explanation:
Here’s the deal:Voice is what makes your writing different from anyone else’s. Special. Unique. It’s what sets you apart.
Are you funny? Sarcastic? Patient? Pessimistic? Always ready with advice? Do you like to write long sentences full of descriptions? Are you more of a quick and to the point kind of person? Do you pour adjectives into your writing thunderstorm-style? Do you like bright, short words that pack a punch?
Use your own voice as you write. There is no one right way to tell any story, write any paper, pen any column. Be yourself on the page, and your writing will shine What matters? Write about what matters in the world, writing as you would if you and I were having a conversation. Use your favorite words, your best anecdotes, your true style and voice. By all means, please use the first person.
It's not clear where the paragraph break is between one and two, but I might be able to help you. The last option is incorrect, because all of the text relates which is why it's hard to determine where the paragraph break might be. Paragraph one does not offer a solution as it isn't until the end we know the cause of the dark day. While both paragraphs have at least one fact, paragraph one seemingly is full of guesses as to the cause of the dark day. This leaves the only correct option as the first one. The researchers decided to investigate the cause of the dark day, and then the results are reported.