FBD in pineapple is take place at:

Correct option is B

Flower Bud Differentiation (FBD) in pineapple occurs at the 40 leaves stage, which is a critical physiological phase marking the transition from vegetative to reproductive growth. Pineapple usually takes 15–18 months to mature depending on variety and environmental factors. The use of chemicals like ethrel (ethephon) can induce flowering earlier and synchronize it for uniform harvest. Proper management of spacing, nutrition, and moisture also influences growth and flowering time.