The correct answer is: D. on, against
The word “pavement” refers to the hard surface of a street or road. The word “lamp post” refers to a tall pole that supports a light. In this sentence, the woman is putting her basket on the pavement and leaning against the lamp post. This means that she is placing her basket on the ground and then resting her body against the pole.
The other options are incorrect because they do not make sense in the context of the sentence. For example, the word “in” does not make sense because the woman is not putting her basket inside the pavement. The word “above” does not make sense because the woman is not putting her basket above the pavement. The word “at” does not make sense because the woman is not putting her basket at the pavement.
I hope this explanation is helpful!