Which sentence uses correct punctuation? A. My mother has an appointment at the IRS (Internal Revenue
Service)
O B. My mother has an appointment at the IRS. Internal Revenue
Service
C. My mother has an appointment at the IRS Internal Revenue
Service
D. My mother has an appointment at the IRS (Internal Revenue
Service)

D

Answer A contains square brackets which aren’t used for defining abbreviations, answer B uses ellipsis which is typically used to show suspense or a change in time etc, answer C doesn’t contain any punctuation to separate the abbreviation from it’s meaning so that sentences doesn’t make any sense, answer D contains rounded brackets (parentheses) which are used to add in extra information- in this case the meaning of the abbreviation