ANS:B - accelerate fruit formation in later stages of growth.

Phosphatic fertilizers are useful during the early stage of plant growth. Phosphorus is an essential nutrient for plant growth and development, playing a critical role in various physiological processes, including photosynthesis, energy transfer, and root development. Phosphorus is particularly important during the early stages of plant growth when plants require adequate phosphorus for root establishment, early growth, and development of reproductive structures. Therefore, phosphatic fertilizers, which supply phosphorus to plants, are beneficial during the early stages of plant growth to ensure healthy root development, vigorous growth, and optimal establishment of the plant. While phosphorus remains important throughout the plant's life cycle, its application during the early stages is particularly crucial for maximizing plant productivity and yield.