Smith states that in one day, the whole world has changed. The unnecessary word in the sentence is "the second Smith".
What is a sentence?
A sentence is a set of words that is complete in itself, typically containing a subject and predicate and sometimes one or more subordinate clauses.
In the given sentence the name ofthe Smith used second time is unnecessary. When a name of a person need to be denoted for the second time the the pronoun can be used.
Therefore, option D is correct.
For more information about sentences; refer to the link:
https://brainly.com/question/696177
