The sentence that is punctuated correctly is:
Without water, the plant will die.
Here's why this sentence is correct:
1. It has a comma after "water," which is used to separate the introductory phrase "Without water" from the main clause "the plant will die."
2. Commas are used to set off introductory words or phrases at the beginning of a sentence, providing clarity and proper punctuation.
Therefore, the sentence "Without water, the plant will die" is correctly punctuated compared to the other options provided.