Fill in the blank with the most appropriate word.
_____ Saturday evening we went out to a concert.
A preposition is a word which comes before a noun or a pronoun and establishes a relationship between the elements of a clause or words. Prepositions can come before verbs in the ground form.
There are six kinds of prepositions: Prepositions for Time, Prepositions for Place, Prepositions for Direction, Prepositions for Agent, Preposition for Instruments and Prepositional Phrases.
Option D is correct as 'Sunday' indicates a particular day.
The other options are wrong as only 'on' can be used before the name of days.
The correct answer is D)On