1 Rocco's painting is bigger than/ the biggest Big Al's painting, but Carla's painting is bigger / the biggest of all.

Решение:

В предложении 1 сравнивается размер картин Рокко и Биг Эла. Затем картины Рокко и Карлы. Правильный вариант выделен.

Rocco's painting is bigger than/ the biggest Big Al's painting, but Carla's painting is bigger / the biggest of all.