The main purpose of the last line of the passage is to signal the reader that steps will follow.
In the first part of the passage, the author is giving some <em>background information</em> about the topic, which functions as an introduction to develop the main topic. The last sentence serves <em>to trigger</em> what the passage is actually concerned in, that is, the different ways in which contamination by this bacterium can be avoided. Thus, what the reader is expecting after the last line are some steps to follow.
Answer: B: earths magnetic field protects it from all types of space weather
Explanation: There is no text provided but this is the one that seems like it would be a good summary compared to the other answers.
B would be your best option because it explains the text more.
Answer:
the second statement
Explanation:
when summarizing we take important points from the text we avoid using emotions or being biased we provide as much factual information we can
