Concept:A participial phrase must be placed right before the subject it describes. Otherwise, the sentence creates a dangling modifier.
Explanation:The phrase "Running quickly" tells us about the person who runs. This person is the subject of the sentence.
In correct grammar, the subject should appear immediately after the comma.
Option B has "he" right after the comma. This makes the sentence clear and logical.
Option A uses passive voice ("was crossed by him") and does not place the subject directly after the phrase. This is a dangling participle.
Option C has "the race" as the subject. A race cannot run, so the meaning is wrong.
Option D has "the line" as the subject. A line cannot run, and the sentence does not make sense.
Thus only option B follows the rule and is grammatically correct.
Answer:Option B: Running quickly, he crossed the finish line.