Questions

Variable costs are expenses that vary in proportion to the amount of goods or services that a business produces. 

Examples of variable cost include labor, packaging and raw materials.

Considering that citizens accused of crimes in the United States have the right to have their case heard in front of a jury of their peers, the government requires that citizens participate in jury duty. This responsibility is mandatory for individuals who are called on to serve. Failure to serve will result in legal punishments.

Ammonia can be dried by Calcium Chloride or calcium hydroxide.

Options A, C and E in the absence of a proper subject add the ‘bag’ automatically to the verb ‘racing for the bus’. So, it does not make any sense as it would mean that the bag is racing for the bus. Option B is incorrect because of the fragment ‘making the documents lose’. Option D doesn't convey the proper meaning.

The scarcity definition of economics is credited to Lionel Robbins.