Answer;
A.Once things are done, there is no need to dwell on them, to worry about them, or to decide who is to blame.
Explanation;
Parallel structure also known as parallelism is the repetition of the same pattern of words or phrases within a sentence or passage to show that two or more ideas have the same level of importance.
-Parallelism allows a writer to achieve a sense of rhythm and order. When sentence structures are not parallel, writing sounds awkward and choppy. Parallel clauses are usually combined with the use of a coordinating conjunction.
