**Question:** A boy can grasp a rattle & recently he become able to transport objects, hand to hand. He can do-

A. Clapping
B. Making a fist
C. Rolling the object
D. Holding an object with both hands

**Core Concept:**
The developmental milestone being assessed in this question is related to the development of fine motor skills in infants, specifically the ability to transport objects, hand-to-hand. This skill, also known as "transportation" or "object transport," is an essential part of the development of hand-eye coordination and fine motor skills in infants.

**Why the Correct Answer is Right:**
The correct answer, **D. Holding an object with both hands**, is the most appropriate response because it represents the advancement from grasping an object (such as grasping a rattle) to a more complex motor skill, specifically holding an object with both hands and transporting it from one hand to another. This skill is a crucial step in the development of hand-eye coordination and fine motor skills.

**Why Each Wrong Option is Incorrect:**

A. Clapping (Option A) is a gross motor skill that involves coordination between the upper limbs, not the fine motor skill being assessed in this question.

B. Making a fist (Option B) is a prerequisite step in the development of transportation skill but not the actual skill being tested.

C. Rolling the object (Option C) is a gross motor skill and not related to the fine motor skill being assessed.

**Clinical Pearl:**
It is essential for parents and healthcare providers to monitor a child's development and note any milestones achieved, as this helps identify potential delays or concerns regarding a child's development and could lead to timely intervention if needed.