[单选题]Acquainted with the Night I have been one acquainted with the night.I have walked out in rain – and back in rain.I have outwalked the furthest city light. I have looked down the saddest city lane.I have passed by the watchman on his beatAnd dropped my eyes, unwilling to explain. I have stood still and stopped the sound of feetWhen far away an interrupted cryCame over houses from another street, But not to call me back or say good-bye;And further still at an unearthly height,One luminary clock against the sky Proclaimed the time was neither wrong nor right.I have been one acquainted with the night.(Robert Frost) Which of the following is true of the poem?

A.The theme is about the alienation of mankind from its environment.
B.The poem follows the model of the Shakespearean sonnet.
C.The speaker seems to enjoy life in a city at night．