Please check my answer thank you very much.

Please reading the following passage then answer the question below.

The sentences are numbered to help you answer the question.

(1) The solar system is made up of the sun and the planets that go around it. (2) The planet closest to the sun is called Mercury. (3) The planet closest to the sun is Venus. (4) Earth is the third planet and Mars is the fourth. (5) Life on Earth is thought to have begun about three billion years ago. (6) For many millions of years, the most common lifeform was bacteria. (7) Scientists have tried to understand how plants and animals developed from these simple, one-celled creatures.

This passage is made up of two paragraphs. Which sentence begins the second paragraph?

A. 4
B. 3
C. 5
D. 6

My answer is D. 6

I disagree. At the beginning of which sentence does the topic shift from planets to life forms?

You are correct. Sentence 6, "For many millions of years, the most common lifeform was bacteria," begins the second paragraph. Good job!

Your answer is incorrect. The sentence that begins the second paragraph is actually C. 5. To determine this, you need to examine the structure and content of the passage. The first paragraph introduces and provides information about the solar system, specifically the planets. In the second paragraph, the topic shifts to the origins of life on Earth and the development of plants and animals. Sentence 5 clearly introduces the idea of life on Earth beginning three billion years ago, which signifies the start of the second paragraph. Therefore, the correct answer is C. 5.