Answer:
B. A person who studies animal behaviour
Explanation:
Option A. would be a more common answer because of all of the comparisons between the <u>pigs and primates</u>, but if paying attention carefully, the document is generally focused on the behaviour of pigs <em>to</em> primates. (Make sense?) The document only metions massages once throughout, so option C. wouldn't be very beneficial to those who want to learn more about that subject.
D is the example in this question
The correct answer is universal truth.
Universal truth is something that should be known to everyone, regardless of their nationality or upbringing. The idea that love conquers all appears in many texts, and it is something that most people, no matter where they live or how old they are, believe in. Therefore, it applies to every nation, and is thus universal.