Answer:
Option A
Explanation:
(A) What the sentence says is that an infant's reactions to its first stressful experiences are part of a natural process of development and are not " harbingers (meaning forerunners of indicators) of childhood unhappiness or.... of adolescent anxiety" The parallel structure employed by the author in this sentence indicates that the missing word must have meaning similar to harbingers. Among the choices, prophetic is the only word with such a meaning and is the answer.
