The term that is being described above is SETTLING POINT. This term has been adopted by some researchers which refers to how our weight thermostats are rather adaptable and are affected by biological factors in the environment. This is based on the setting-point hypothesis.
It is definitely not a primary source: this would be a book itself.
Now, is it a tertiary source? I don't think so: the author of the review should have read the book and should only be referring to this book in the review.
I think it's a secondary source.
Answer:
d. Fluid intelligence
Explanation:
Fluid intelligence -
It is the capacity to solve the problem in a novel situations and think logically and independence regarding the acquired knowledge .
The ability of fluid intelligence involves to determine the patterns and relationships which holds the novel problems and to assume these findings using logic .
Hence , the correct option for the given information is d. Fluid intelligence .