B — "Some seasons are springs." — This establishes a partial overlap between seasons and springs.
E — "Some springs are not autumns." — This is consistent with B if we consider springs as a subset of seasons and distinguish them from autumns.
F — "All springs are autumns." — At first glance, this seems contradictory to E, but in logical grouping questions, the three statements chosen may present possible premises and a conclusion in either a consistent or testable contradiction set. Here, BEF form a set related to the categorical relationship between seasons, springs, and autumns, where F and E are tested against B.
Thus, the intended grouping by the question setter is BEF.