A child climbs with alternate steps, builds a tower of 8-9 cubes, tells I but not his name and cannot say his age and sex the probable age is:
**Core Concept**
The question assesses the developmental milestones of a child, focusing on gross motor skills, fine motor skills, and language development. Developmental milestones are essential markers of a child's growth and maturation.
**Why the Correct Answer is Right**
Given the child can climb with alternate steps and build a tower of 8-9 cubes, these abilities typically correspond to a child around 3 years of age. At this age, children often have limited vocabulary and may be able to say simple words like "I" but struggle with more complex information such as their name, age, and sex.
**Why Each Wrong Option is Incorrect**
**Option A:** This option would likely correspond to an earlier developmental stage.
**Option B:** Similarly, this option might be too early for the described abilities.
**Option D:** This option seems too advanced for a child who cannot say their name or age.
**Clinical Pearl / High-Yield Fact**
Remembering that by 3 years of age, a child should be able to perform certain tasks such as climbing, building towers, and using around 100 words, is crucial for assessing developmental delays.
**Correct Answer:** C. 3 years.