Which phrase best describes the mood established in these sentences from Silent Spring?

There was a strange stillness. The birds, for example—where had they gone? Many
people spoke of them, puzzled and disturbed. The feeding stations in the backyards
were deserted. The few birds seen anywhere were moribund; they trembled
violently and could not fly. It was a spring without voices.

Question 5 options:

mysterious and frightening

hectic and confusing

sad and regretful

bitter and angry

me  

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innocence can be defined as the lack of sin, relating it with the lack of guilt, also it can be a synonime of naivety. most people agree that sins are made out of experiences, intentionally or not, as well as you stop being naive once certain things happen to you throughout your life. so, with this explained, the chosen answers are:

when the boy saw the effects of war, he no longer viewed life as innocent.

the loss of innocence is a result of gaining experience and making mistakes.

one way to define innocence is as a lack of worldly experience or sophistication.