I believe the correct answer is naive.
The author is trying to say that he was ignorant, and that he couldn't understand properly these new revelations. He was either too young or too stupid to understand such a thing, but he believes he will as he grows older.
The word that best complete the sentence above is option D which is egregious.
<h3>What is a sentence?</h3>
A sentence refer to collections of words that have a subject and predicate which can consist of noun and verb with meaning.
Therefore, The word that best complete the sentence above is option D which is egregious
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Answer: Age
Explanation: Age always goes up, but doesn't go down.