Correct option is C
A material usage variance is a difference between the actual quantity of materials used and the standard quantity of materials that should have been used in a production process. There are several reasons why a material usage variance may occur:
1. Inefficient production processes: If the production processes are not efficient, more materials may be used to produce the same quantity of output, resulting in a higher material usage variance.
2. Poor quality materials: If poor quality materials are used in the production process, more materials may be needed to produce the desired quality of output, resulting in a higher material usage variance.
3. Machine breakdowns: Machine breakdowns may cause production delays and result in more materials being used than planned to compensate for the lost production time, resulting in a higher material usage variance.
4. Inaccurate standards: If the standard quantity of materials is set too high, it may result in a higher material usage variance. This may occur if the standard was based on incorrect assumptions, outdated information, or unrealistic expectations.
5. Theft or waste: Theft or waste of materials can lead to a higher material usage variance.

