Final answer:
The correct words to complete the sentence about enjoying a variety of foods and the liveliness of Swedish society are 'smorgasbord' and 'vitality', making option B the best choice.
Step-by-step explanation:
The item containing the best words for completing the sentence 'While in Sweden, we enjoyed a _____________ of breads and cheeses and the _____________ of the Swedish society' is B) smorgasbord; vitality. A smorgasbord refers to a buffet-style meal with a variety of hot and cold dishes of various foods on a table, originating from Sweden, which fits the context of enjoying a variety of breads and cheeses.
Vitality means the state of being strong and active or energetic, which is appropriate for describing the lively and dynamic aspect of Swedish society.