Hydra budding involves DNA replication and growth

Steps:

• Identify the process as asexual budding in hydra, where a new individual forms on the parent.
• Note that DNA replication occurs in the parent's cells to provide genetic material for the bud.
• Observe that the bud enlarges through cellular growth and differentiation.
• Conclude that mitosis, while typically involved earlier, is not a distinct process evident in the attached developing stage shown.

Why A is correct:

• Budding requires DNA replication to copy parental genome and growth to form the bud structure, per standard cnidarian reproduction definitions.

Why the others are wrong:

• B omits growth, essential for bud development from a small outgrowth to a full hydra.
• C excludes DNA replication, needed to equip bud cells with identical genetic information.
• D includes mitosis, which precedes but does not actively occur in the visible attached development phase.

Final answer: A