Which sentence is a run-on sentence? A. The day after tomorrow, Louisa will run in a 5-mile race to raise money for charity. B. Some people stretch before exercising; I prefer to jog slowly. C. I like to run laps around the track, but Louisa enjoys running on the cross-country trails. D. Louisa stretches before she runs, she also stretches after she runs. i need help on this one