Step 1: Understanding the Concept:
Sports injuries are classified into three main categories: Soft Tissue Injuries (skin, muscles, ligaments), Bone Injuries (fractures), and Joint Injuries (dislocations). Each injury has specific physical symptoms that help in identification.
Step 2: Key Formula or Approach:
Ligament injury = Sprain (Ankle common).
Blood collection/Bruising = Contusion or Hematoma.
Skin scraping = Abrasion.
Bone bending = Greenstick fracture.
Step 3: Detailed Explanation:
Step 4: Final Answer:
(i) (C) Sprain
(ii) (A) Contusion
(iii) (B) Rubbing away of the upper layer of epidermis
(iv) (C) Greenstick fracture
These four sub-answers can be worked out by grouping sports injuries into two families, soft-tissue injuries (skin and connective tissue) and bone injuries, and placing each character's symptom into the right family.
Soft-tissue injuries in this case:
Rohan's twisted, swollen, painful ankle points to a joint/ligament problem rather than a skin or bone one, so his injury is a sprain.
Sachin's forehead shows blood pooled beneath unbroken skin from a knock, which is a contusion, and if the skin itself had been scraped off instead, that would be an abrasion, identified by the top layer of skin being rubbed away.
Bone injury in this case:
The last sub-question is about a bone that bends rather than breaks cleanly. Children's and teenagers' bones have more flexibility than an adult's, so instead of snapping, the bone develops a partial crack while staying bent, this specific pattern is called a greenstick fracture.
Putting the two families together: (i) Sprain, (ii) Contusion, (iii) Rubbing away of the upper layer of the epidermis, (iv) Greenstick fracture.

| List-I | (Traits) | List-II | (Explanation) |
| A | Cardinal Traits | (I) | Based on 3 factors |
| B | Central Traits | (II) | That reflect only in certain circumstances |
| C | Assessment of Traits | (III) | Building blocks that shape most of our behaviour |
| D | Secondary Traits | (IV) | Dominant behaviour |