The Error Written into KW::insert Function Below Can Be Corrected

Multiple Choice

The error written into KW::insert function below can be corrected with the code __________.

A) (next_pos != first || *next_pos < *(next_pos - 1) )
B) (next_pos != first && *(next_pos - 1) < *next_pos)
C) std::iter_swap(next_pos - 1, next_pos)
D) --next_post;