Which group of words forms a complete sentence?

• A. Anytime after 6:00 p.m., or all day Sunday.
• B. A tornado warning was posted.
• C. Replacing the roof tomorrow.
• D. A picture of Uncle Lou holding a cat.

Answer: (B)

The choice that forms a complete sentence is "A tornado warning was posted." This statement contains a subject ("A tornado warning") and a verb ("was posted"), which together convey a complete thought. Complete sentences need at least these two elements to convey a clear message, and in this case, the sentence informs the reader that a specific action regarding a tornado warning has taken place.

The other choices do not form complete sentences because they either lack a verb or do not express a complete thought. The first choice refers to a time frame without stating an action or event. The third choice does not include a verb and leaves the thought incomplete, as it only mentions an action (replacing the roof) without clarifying what happens next. Similarly, the fourth choice presents a phrase without a verb, instead describing a picture but not stating an action related to it, leaving the reader uncertain about what is being conveyed. Thus, only the second choice meets the criteria of a complete sentence.