To approach an essay question like this one, you need to identify the issue (cell phone use in the classroom) and then decide which side you agree with. The next step is to consider the reasons why you agree with that side. Those reasons become the body paragraphs of your paper. For each paragraph, write the reason as a topic sentence. Then explain that point, including specific examples that support your position, before concluding that point and moving on to the next reason in a new paragraph. Make sure you include a proper introductory paragraph that introduces your topic and states your position and a concluding paragraph that summarizes your argument.
I believe that the idea which is addressed in the passage above is friendship and love.
You can see that there is a strong friendship between Lancelot and Arthur, even though Lancelot is seeing his wife behind his back. On the other hand, we can see the theme of love between Lancelot and Guinevere, even though Arthur is not aware of that.
The answer is B because it does lost a specific purpose