Which one of the following sentences contains at least one error?

a. in order to assure that you have received the correct correspondence you must contact a representative from the personnel department.
b. you are required to list all of your dependants on the medical form for legal purposes.
c. vacation hours are accrued based on employee seniority and amount of hours physically worked within a pay period.
d. the benefits form must reflect your social security number as well as your current address.