Identify the sentence that is correctly punctuated.

Correct option is C

This sentence is correctly punctuated because:
The reporting clause "My sister said" is followed by a comma, which is the correct punctuation for introducing direct speech.
The quoted speech is enclosed in quotation marks.
The contraction "I’ll" is correctly used, and the apostrophe in "it’s" indicates the correct form of "it is."
The comma is placed correctly after "bill" to separate the clauses.
The other options have punctuation errors:
(A) is missing quotation marks and commas.
(B) does not include a comma after "bill" to separate the clauses properly.
(D) incorrectly places commas and quotation marks, disrupting the flow of the sentence.