**Core Concept**
The question assesses the child's developmental milestones, specifically her gross and fine motor skills, language and cognitive development, and self-awareness. These milestones are essential for determining a child's age and developmental stage.

**Why the Correct Answer is Right**
The child's ability to dress herself suggests she has achieved fine motor skills development, typically seen in children around the age of 4-5 years. Her knowledge of her gender indicates language and cognitive development, which usually occurs between 2-3 years of age. However, the ability to feed without spilling is a more refined fine motor skill, often acquired at an older age, around 4-5 years. This combination of skills suggests the child is likely around 4-5 years old.

**Why Each Wrong Option is Incorrect**
**Option A:** This age is too young, as children typically start to dress themselves around 3-4 years of age.
**Option B:** This age is too old, as most children master feeding without spilling by around 4-5 years of age.
**Option C:** This age is too young, as children at this age may still be developing their fine motor skills and may not be able to feed themselves without spilling.

**Clinical Pearl / High-Yield Fact**
Keep in mind the "Red Flags" for developmental delays: failure to smile by 6 months, no single words by 16 months, and no two-word phrases by 24 months.

**Correct Answer: C. 4 years.**