Final answer:
We were sitting, 2)as I remember, in a riverside restaurant.
Step-by-step explanation:
The question asks for the most suitable conjunction to complete the given sentence fragment, which describes a scenario of people sitting and remembering an experience at a riverside restaurant. When choosing a conjunction to fill the blank, the conjunction should logically connect the thoughts or actions in the sentence. In this case, the sentence is continuing a scene that is reflective and not introducing a contrast or an alternative situation.
The appropriate conjunction for this sentence would be option 2) 'as'. The conjunction 'as' is often used to indicate that something happens during the time when something else is taking place. Other options like 'whereas', 'and', and 'yet' do not fit as well contextually. 'Whereas' is used to contrast two statements, 'and' is a simple addition that does not convey simultaneity, and 'yet' introduces a contrast or unexpected result, which is not implied in the excerpt.