The nightingale unaware in ode to a Nightingale is that he fear of human morality.
What is ode to a Nightingale?
Ode to a Nightingale is a poem that is written by John Keats.
Ode to a Nightingale is an individual poem which depicts the journey of Keats into the state of counter or negative ability.
This poem is about the experience of the poet to listen in to the bonny song of the bird nightingale.
The poet tells about the nightingale unaware in the third stanza of the poem, in which he is fright of human morality, and also denominates that saying he would like to bury the difficulties.
Therefore, option A is correct.
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