**Core Concept:** Child development milestones refer to achievements in physical, cognitive, and social-emotional domains that occur during childhood. These milestones serve as markers of healthy growth and development. In this question, we are assessing understanding of typical motor milestones in a 15-month-old child.

**Why the Correct Answer is Right:** A 15-month-old child can typically perform a wide range of motor skills, such as:

1. **Option A:** **Sitting independently**: At around 6 months, most children begin to sit without support, and by 9-10 months, they can sit independently. This skill is usually achieved by the end of the 1st year.
2. **Option B:** **Standing**: Children typically stand with support around 9-10 months and can stand independently around 12-15 months.
3. **Option C:** **Walking**: Most children begin to take their first steps between 10-12 months, and by 18-20 months, they usually walk without assistance. However, some children may take longer to walk.
4. **Option D:** **Jumping**: Jumping is a more advanced skill that may not be achieved until after a child has learned to walk and run.

**Why Each Wrong Option is Incorrect:**

1. **Option A (Sitting independently)**: Although sitting is an important milestone, a 15-month-old child should be able to sit independently.
2. **Option B (Standing)**: Standing with support is achieved earlier, around 9-10 months, and standing independently is achieved around 12-15 months.
3. **Option C (Walking)**: Most children can walk between 10-12 months, but some may take longer. The ability to walk is considered a milestone typically achieved before jumping.
4. **Option D (Jumping)**: Jumping is an advanced skill that may be achieved after a child has learned to walk and run.

**Clinical Pearls:**

Understanding child development milestones is crucial for healthcare providers in assessing a child's overall development and identifying potential developmental delays. One should be aware of the typical progression of motor skills in young children to identify if there are any developmental concerns.

**Correct Answer:** **Option C (Walking)**: A 15-month-old child should be able to walk without assistance. While some children may walk earlier or later, the ability to walk is considered a crucial milestone for assessing overall development.

**Why Option D (Jumping)** is incorrect: Jumping is considered an advanced motor skill that develops later than walking and running. It is usually achieved after children have learned to walk and run.