Directions: Fill in the blank with the correct preposition.

My parents introduced me to people of various cultures _______ an early age.

 In this context the correct answer is ‘at’. The preposition ‘at’ is used to indicate the time or agewhen something happens. Here it indicates the age when my parents introduced me to people ofvarious cultures, i.e. at an early age. ‘In’ indicates that something happens or is situated somewhere.The preposition ‘on’ is used to indicate that something is grounds for a statement, way of thinking, oraction. ‘For’ indicates something that is intended to benefit somebody or something.