1-C. Until then, I'd been really struggling in my art classes, but after I realized my weakness, I started learning again and my art got much better.Until then, I'd been really struggling in my art classes, but after I realized my weakness, I started learning again and my art got much better.
2-C. She might be talented enough to attend an art college in France, but she has a big weakness as an artist.She might be talented enough to attend an art college in France, but she has a big weakness as an artist.