Childhood

Preschool stage

Step 1: Early childhood covers the age range of 2 to 6 years. Step 2: During this period, children have not yet started formal school education. Step 3: Because this period comes before formal schooling, it is commonly called the 'preschool stage'. Step 4: 'Primary school stage' refers to when children begin formal education (typically after age 6). 'Adolescent stage' is for teenagers. 'Sensori-motor stage' is Piaget's cognitive stage for infants (0–2 years). So, preschool stage is correct.

Pre-operational stage

Step 1: Piaget proposed four stages of cognitive development. Step 2: The Sensori-motor stage is for children from birth to 2 years. Step 3: The Pre-operational stage covers ages 2–7 years — children in early childhood fall here. Step 4: The Concrete operational stage is for ages 7–11 years, and the Formal operational stage is for age 11 and above. Step 5: So children aged 2–7 years are in the Pre-operational stage, where they use symbols but show egocentrism and centration.

Cannot see the world from someone else's point of view

Step 1: Egocentrism is a key characteristic of the pre-operational stage. Step 2: It does NOT mean the child is selfish or greedy in a moral sense. Step 3: It means the child can only understand situations from their own perspective and cannot imagine how another person might see or feel about the same situation. Step 4: 'Focusing on one feature of an object' describes 'centration', which is a different concept. Step 5: 'Cannot use symbols' is incorrect — symbol use is actually a key ability in the pre-operational stage.

Age 6

Step 1: There is a huge language explosion during early childhood (ages 3–6). Step 2: At age 3, a child has a spoken vocabulary of approximately 900 words. Step 3: By age 6, this vocabulary dramatically expands to between 8,000 and 14,000 words. Step 4: This rapid growth in vocabulary is part of the language explosion in the pre-operational stage. Step 5: Age 9 is in middle childhood, and the question specifically refers to the language explosion during early childhood, so age 6 is correct.