Under the Percentage of Completion Method, the Amount of Work

Under the percentage of completion method, the amount of work completed in a particular year is typically determined by comparing which of the following?

A) The total costs incurred to date divided by the contract price.
B) The cost incurred that year divided by the contract price.
C) The total costs incurred to date divided by the cash collected to date from the customer.
D) The costs incurred that year divided by the estimated total costs of the project.