Answer:

Introduction:
In this question, we are asked to identify the anatomically correct structure among the given options. Let's analyze each option and determine the correct answer.

Options Analysis:
a) Collar bones - 3 pairs
- The correct anatomical term for collar bones is clavicles.
- In humans, there is only one pair of clavicles, not three pairs.
- Therefore, this option is incorrect.

b) Salivary glands - 1 pair
- Salivary glands are a group of glands that produce saliva in the mouth.
- There are three pairs of major salivary glands: parotid, submandibular, and sublingual glands.
- Each pair of major salivary glands has its own specific location and function.
- Therefore, this option is incorrect.

c) Cranial nerves - 10 pairs
- Cranial nerves are a set of 12 pairs of nerves that originate from the brain.
- They are responsible for controlling various functions of the head and neck.
- The cranial nerves are numbered I to XII, and each number corresponds to a specific nerve.
- Therefore, this option is incorrect as there are 12 pairs of cranial nerves, not 10.

d) Floating ribs - 2 pairs
- The correct anatomical term for floating ribs is vertebral ribs.
- There are 12 pairs of ribs in the human body, with the first seven pairs being true ribs, the next three pairs being false ribs, and the last two pairs being floating ribs.
- Floating ribs do not have a direct connection to the sternum or the anterior part of the rib cage.
- Therefore, this option is correct as there are indeed 2 pairs of floating ribs.

Conclusion:
After analyzing all the options, we can conclude that option d) "Floating ribs - 2 pairs" is anatomically correct. The other options, a) Collar bones - 3 pairs, b) Salivary glands - 1 pair, and c) Cranial nerves - 10 pairs, are incorrect.