The answer is c. reverse its polarity.
Answer:.......... The densest surface water masses in the oceans are the North Atlantic Deepwater and Antarctic Deepwater.
Unfortunately I do not understand what you are needing. It looks to me that you need to look up several facts and then create a presentation on law, public safety, and security careers. And the best place to look that info up on is online. Sorry if this isn't what you need but i do hope that this helps!
Answer: Agreement / Addition / Similarity
Explanation: The transition words like also, in addition, and, likewise, add information, reinforce ideas, and express agreement with preceding material.