The correct option is C 44100
Given,
Volume of box=0.7 m3
Dimensions of the store room
=42 m×35 m×21 m
Volume of store room=42×35×21
=30870 m3
Therefore, the number of boxes that can be stored in the room
=Volume of the roomVolume of one box=308700.7=44100
∴ Number of cuboidal boxes that can be stored in the room is 44100.