0+0i is ______________________for complex number z

0+0i is ______________________for complex number z.
A. additive inverse
B. additive identity element
C. multiplicative identity element
D. multiplicative inverse
Right option is B. additive identity element

For explanation I would say: On adding zero (0+0i) to a complex number, we get same complex number so 0+0i is additive identity element for complex number z i.e. z+0 = z.