Why did it surprise people when Lorenzo Papatini danced the waltz with his dance partner in Boston? because he made close physical contact with his partner because they had not practiced the dance enough because Mrs. Otis did not plan to have dancing at her party

Only three options have been mentioned here while presumably the fourth one is the correct one.

That is, people were surprised when Lorenzo Papatini danced the waltz with his partner in Boston because his waltz was smoother and much slower than the one people knew in Boston. This dance routine came to be known as "The Boston". He danced with his partner in 1834 when Mrs. Otis invited him to give a dance exhibition at her residence.