A child climbs with alternate steps, builds a tower8- 9 cubes, tells 'I' but not his name and can not say his age and sex, the probable age is -

Ans. is 'c' i.e., 30 months o A child climbs stairs with alternating feet, refers to self as 'I' and builds a tower of 9 cubes by the age of 30 months. o A child knows his gender and age by 3 years.