D: The pizza delivery boy was neither early nor late: he was right on time.
(D) The pizza delivery boy was neither early nor late: he was right on time.
Option (A): The statement given in the question is not correct because there is no punctuations to differentiate the sentences.
Option (B): The commas are generally used after conjunctions to connect two clauses with independent meaning and it is used after a dependent clause. From the given sentence, there are two independent clauses but there is no conjunction between the sentences.
Option (C): The semicolon used here is correct but there is a conjunction after semicolon which is not correct. The semicolon is used to separate two clauses with independent meaning.
Option (D): A colon is used between two clauses with independent meaning while the second sentence expands the first sentence. So, this is the correct answer.
