What punctuation is needed in the following sentence to make it correct? In addition to the hospital's regularly scheduled festivities, the custodians celebrate with a party of their own.
Correct Answer: B
Rationale: The correct punctuation needed in the sentence is a comma. A comma should be placed after 'festivities' to separate the two independent clauses in the sentence: 'In addition to the hospital's regularly scheduled festivities' and 'the custodians celebrate with a party of their own.' The comma helps in improving the clarity and structure of the sentence by indicating a pause between the clauses.
Choice A, 'Period,' is incorrect because a period would create two separate sentences rather than connecting the related clauses. Choice C, 'Apostrophe,' is incorrect as there is no need for an apostrophe in this context. Choice D, 'Semicolon,' is incorrect because a semicolon is used to join closely related independent clauses, which is not the case in the given sentence.