The best answer is A) <span>after selecting a topic as a means of getting general information
An encyclopedia entry, or Wikipedia article, is a great resource for getting general information on a topic. You probably won't be able to use to too extensively for citations or for an in-depth understanding of your topic, but you will get a broad survey which can help you to decide if you want to write about it and to have a general idea of it. </span>
<span>(PCR) is a technique used to take a piece of DNA and make many copies of it</span>
Answer:
After <em>living room </em>and before <em>It is important</em>... you need a period.
Capitalize your i's
