Single or multiple units of distinct services or products are classified as

cost
job
post
price

The correct answer is B. job.

A job is a unit of work that is assigned to a person or group of people. It can be a single task or a series of tasks that are related to each other. Jobs can be classified into different categories, such as manual labor, professional, and managerial.

The other options are incorrect because:

  • A. cost is the amount of money that is required to produce or purchase something.
  • C. post is a position or office that is held by someone.
  • D. price is the amount of money that is asked for something that is being sold.