Question

A girl can walk upstairs, alternating feet, and make a tower of 8 cubes. She refers to herself by the pronoun 'I', knows her name, but not her age and gender. The most likely chronological age is

• A. 24 months
• B. 30 months
• C. 36 months
• D. 42 months

Hint:

Notice which skills she already has and which ones, like knowing her age and gender, she has not reached yet.

Answer 1

The Correct Option is B

Step 1: Understanding the Question.
We are given a set of milestones and asked to match them to the closest age band on a standard developmental chart.

Step 2: Key Concept.
Developmental milestones are grouped by age. Around 24 months, a child usually climbs stairs one step at a time holding a rail, without alternating feet, and can stack about 6 to 7 cubes. Around 30 months, the child starts walking upstairs with alternating feet, though downstairs still needs two feet per step, can build a tower of about 8 cubes, and begins using pronouns like I, me, and you. By 36 months, the child walks both up and down stairs with alternating feet and, importantly, now knows their own age and gender.

Step 3: Detailed Explanation.
The child in the question already climbs stairs alternating feet and stacks 8 cubes, which is more advanced than the 24 month stage, ruling out option (A).
She uses the pronoun 'I' and knows her name, both consistent with the 30 month stage.
She does NOT yet know her age or gender, and knowing one's own age and gender is a milestone that typically appears by 36 months. Since this child has not reached that milestone yet, options (C) and (D), which represent 36 and 42 months, do not fit.

Step 4: Final Answer.
The mix of skills already present, alternating feet upstairs, an 8 cube tower, and use of 'I', together with the skills still missing, knowing age and gender, places this child at about 30 months. \[ \boxed{30\ \text{months}} \]