The correct answer is C. PF contribution.
PF contribution is a mandatory contribution that employers and employees make to the Employees’ Provident Fund (EPF) scheme. The EPF scheme is a social security scheme that provides benefits to employees in the event of retirement, death, or disability. The amount of PF contribution is based on the employee’s salary, and the employer and employee each contribute 12% of the employee’s salary.
The number of workers employed is used as a basis for the apportionment of PF contribution because it is a good indicator of the size of the business. The larger the business, the more workers it is likely to employ, and therefore the more PF contribution it will need to make.
The other options are not correct because they are not based on the number of workers employed. Rent is a cost that is incurred regardless of the number of workers employed, canteen expenses are a cost that is incurred to provide food for employees, and rate and tax are costs that are incurred to the government.