Which of the Following Is Correct

Which of the following is correct?

A) Beginning raw material inventory + raw material required for production - desired ending raw material inventory = required raw material to be purchased.
B) Beginning raw material inventory + desired ending raw material inventory - raw material required for production = required raw material to be purchased.
C) Raw material required for production + beginning raw material inventory - desired ending raw material inventory = required raw material to be purchased.
D) Raw material required for production + desired ending raw material inventory - beginning raw material inventory = required raw material to be purchased.