Which of the following is a complete sentence?
A. When I was young and loved going for runs in the park.
B. I walked all three dogs around the park this morning.
C. Walking with a limp as a result of the thorn.
D. Running through the park before breakfast.
A complete sentence has a subject (noun), verb, capital letters, punctuation and finally must make sense. B is the only complete sentence that explains the action and nouns in a way that makes sense.
Therefore, the Correct Answer is B.