Which best states what the imagery in the excerpt suggests?

this is a delicious evening, when the whole body is one sense, and imbibes delight through every pore. i go and come with a strange liberty in nature, a part of herself. as i walk along the stony shore of the pond in my shirt-sleeves, though it is cool as well as cloudy and windy, and i see nothing special to attract me, all the elements are unusually congenial to me.

a; thoreau believes he is the only one to ever experience this type of night.
b; thoreau believes he is experiencing a perfect night that will never happen again.
c; thoreau feels like an outsider as he observes the objects in his environment.
d; thoreau feels as if he is in harmony with the aspects of his environment.