According to Piaget's Cognitive Developmental Theory, until about age 6, it is difficult for children to think:

• A. abstractly and hypothetically
• B. about the conservation of mass
• C. logically about concrete events
• D. in terms of object permanence

Answer: (A)

Verified step by step guidance

1. Understand Piaget's stages of cognitive development, focusing on the Preoperational stage, which typically lasts from about age 2 to 7 years.
2. Recognize that during the Preoperational stage, children have difficulty with abstract and hypothetical thinking, which develops later in the Formal Operational stage (starting around age 11).
3. Note that children in this stage can think logically about concrete events but struggle with abstract concepts and hypothetical scenarios.
4. Recall that object permanence is usually developed earlier, during the Sensorimotor stage (birth to about 2 years), so children older than 2 generally understand this concept.
5. Conclude that the difficulty for children until about age 6 is primarily with thinking abstractly and hypothetically, as per Piaget's theory.