Which sentence is punctuated correctly?

Correct option is B

Solution- The Correct Answer: B.  Where are you going?
The sentence is a question.
Questions must end with a question mark (?).
Options:
(a) ends with a period (.) → wrong for a question.
(b) ends with a question mark (?) → correct.
(c) ends with an exclamation mark (!) → shows strong feeling, not correct here.
(d) ends with a comma (,) → incomplete punctuation.
Information Booster-
Types of punctuation marks:
. → full stop (statements).
? → question mark (direct questions).
! → exclamation mark (strong emotions).
, → comma (pause, list items).
Additional Information-
Golden Rule: Every interrogative sentence must end with a question mark (?).
Trick: If the sentence begins with Wh- (what, where, when, who) or helping verb (is, are, do, can), it usually ends with a ?.​​