Choose the most appropriate option to change the voice (active / passive) form of the given sentence.
My birthday was celebrated by my colleagues at the office today.

Options

A. a) My colleagues will celebrate my birthday at the office today.
B. b) My colleagues have celebrated my birthday at the office today.
C. c) My colleagues are celebrateing my birthday at the office today.
D. d) My colleagues celebrated my birthday at the office today.

Answer

D