Answer: It is used to emphasize that fact that this is an opinion, not a fact.
Explanation: Immigration has been a very controversial topic for several years; naturally, everyone has their own opinion regarding the matter. By placing the word "taking" in quotations, the author is conveying the point of view of a specific group, that is, those opposed to immigration, without indicating his/her own stance.
Explanation: The sentence is addressing car buyers having something, in this instance a choice. When the subject is possessive, you use their. Such as, the car buyers ate <em>their</em> lunch.
