Final answer:
The volume of the rectangular box is calculated using the formula volume = length × width × height, which yields 65.856 cm³.
Step-by-step explanation:
To calculate the volume of a rectangular prism you use the formula: volume = length × width × height. In this case, the dimensions given are 6.8 cm, 4.2 cm, and 2.3 cm. Therefore, the volume calculation will be:
Volume = 6.8 cm × 4.2 cm × 2.3 cm = 65.856 cm³
Hence, the correct answer is a) 65.856 cm³.