The lacking in first four or five years can be adverse because it is the main period of development. So, I is implicit. Since nothing is mentioned about the predictability of intelligence, II is not implicit.
Statement: Lack of stimulation in the first four or five years of life can have adverse consequences. Assumptions: I. A great part of the development of observed intelligence occurs in the earliest years of life II. 50 percent of the measurable intelligence at age of 17 is already predictable by the age of four.
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Question context
This question is part of 🧩 Logical Reasoning within the broader 🧠 Aptitude Mastery subject and appears in the DemoPaper-Pakistan preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.