Fill in the blank with a suitable preposition with the help of the hint in the brackets.
The decorations for the party were done _______ her kids. (The kids were in charge of the decorations)
The prepositions ‘by’ and ‘with’ are used to denote the manner in which an action is performed. ‘By’ is used to refer to the person or people who perform something, while ‘with’ is used to refer to the tool used for performing something. In the given sentence, ‘her kids’ did the decorations, therefore ‘by’ is the apt answer. Hence option D is correct, while option A is incorrect. On the other hand ‘in’ and ‘on’ are used to refer to a place. ‘In’ is used to refer to being inside a large space while ‘on’ is used to refer to placing something on a surface or object. Since the kids are neither of these options B and C are incorrect.