Final answer:
Badminton transitioned to a competitive sport with the establishment of the IBF in 1934, its Olympic inclusion in 1992, and through prestigious tournaments like the All England Open.
Step-by-step explanation:
Badminton evolved from a casual party game to a serious sport most notably with the establishment of the International Badminton Federation (IBF) in 1934 (Option A). This significant event demonstrated a formal recognition and dedication to organizing the sport on an international scale, marking its transition from leisure activity to competitive sport. Later advancements, such as the inclusion of Badminton as an Olympic sport in 1992 (Option B) and the organization of prestigious Badminton tournaments like the All England Open (Option E), further cemented Badminton’s status as a serious, competitive sport.