**Core Concept**
The question assesses the cognitive and motor development milestones in a 3-year-old child. Fine motor skills, problem-solving abilities, and imitation are key aspects of this stage. The correct answer reflects the typical developmental achievements of a 3-year-old child.

**Why the Correct Answer is Right**
Making a bridge of 3 cubes is a classic example of a fine motor skill milestone, which typically develops around 3 years of age. Children at this stage begin to demonstrate improved hand-eye coordination, dexterity, and problem-solving abilities. This activity requires the child to manipulate and balance the cubes, showcasing their emerging spatial awareness and creativity. The cognitive development also allows the child to understand cause-and-effect relationships and experiment with different configurations.

**Why Each Wrong Option is Incorrect**
**Option B:** Copying a square is a more advanced fine motor skill that is typically achieved around 4-5 years of age, making it an incorrect choice for a 3-year-old child.

**Option C:** Identifying left and right is a cognitive milestone that usually develops around 4-5 years of age, as it requires a higher level of understanding of spatial relationships and language skills.

**Option D:** Pronouncing words like "I", "you", and "me" is a language development milestone that typically occurs around 2-3 years of age, but it is not as specific to fine motor skills as making a bridge of 3 cubes.

**Clinical Pearl / High-Yield Fact**
Remember that the "3-year-old rule" states that a child should be able to make a bridge of 3 cubes with their fingers, indicating normal fine motor development. This is an important milestone to assess during pediatric check-ups.

**✓ Correct Answer: A. Make bridge of 3 cubes**