Answer:
(D) It is a moment of realization
Explanation:
The sentence “Feld had a sudden insight” shows that it is referring to an epiphany. That means Feld experiences the moment when he realized something. This realization moment can be said to be a form of enlightenment experience.
Epiphany can also be considered "enlightened thinking". From a philosophical point of view, enlightenment means a deep sense of satisfaction, or the sense of understanding the essence of a concept. It can also be said to be the feeling of making something resolved, clarified or complete.