Which of these is a complete sentence

- "I went to the store."

- "Running in the park."
- "Having lunch with friends."
- "Beautiful scenery."
- "Playing tennis at the club."

The only complete sentence among these options is "I went to the store."

To identify a complete sentence, there are a few criteria to consider. A complete sentence must have a subject, which is generally a noun or pronoun that performs the action, and a predicate, which is a verb that expresses the action or state of being. Additionally, it should convey a complete thought and be grammatically correct. Here are some examples:

1. "She ran to the store." - This is a complete sentence. It has a subject ("she") and a predicate ("ran to the store"), and it expresses a complete thought.
2. "Running fast." - This is not a complete sentence. It lacks a subject and does not express a complete thought.
3. "The cat sat on the mat." - This is a complete sentence. It has a subject ("the cat") and a predicate ("sat on the mat"), and it expresses a complete thought.

In conclusion, the first and third examples above are complete sentences.