Fill in the blank with a suitable preposition.
Sheela bought twenty kilos ________ potatoes for the feast.
The preposition ‘of’ is commonly used to denote belonging or what something is made of. In addition to this ‘of’ is used along with objects to also serve as a measurement. In the given sentence the 'twenty kilos' are made up of 'potatoes', hence ‘of’ is the suitable answer. Therefore option C is correct. On the other hand ‘for’ is a preposition of reason whereas ‘with’ is a preposition of agency that is used to refer to a tool. Sheela didn't buy twenty kilos for the sake of the potatoes. Similarly, she didn't use the potatoes as a tool to buy twenty kilos. Hence options A and B are incorrect. Whereas ‘along’ is a preposition of place which is unsuitable here because 'potatoes' are not a place, therefore, option D is incorrect.