Flaunt means to display something proudly or ostentatiously to attract attention or admiration.
Sentence:
The film star flaunted his new luxury car.
→ The film star showed off his new luxury car.
Option Analysis:
A. floated ❌ = moved on water or in the air
B. flaunted ✅ = showed off proudly
C. floored ❌ = shocked greatly / knocked down
D. flounted ❌ = not a standard English word