Question

bill means :
an assumption on which rests the validity of something else
a line of text indicating what the passage below it is about
a mode of expression typical of a person, group, or period
an itemized statement of money owed for goods or services

Explanation:

The word "bill" has multiple meanings. One of the common meanings in a business or financial context is an itemized statement of money owed for goods or services.

Answer:

an itemized statement of money owed for goods or services