Mitotic inhibitors target proliferating cells, impacting regeneration and growth

Steps:

• The drug kills cells in mitosis, blocking cell division in proliferative tissues.
• Stem cells (3) rely on mitosis for self-renewal, so their numbers decline.
• Tissue repair (4) depends on mitotic proliferation to replace damaged cells.
• Tumour formation (5) requires uncontrolled mitosis for cancer cell expansion.
• Cell repair (1) and replacement (2) involve non-proliferative maintenance or differentiation, unaffected directly.

Why D is correct:

• It selects processes tied to mitosis: stem cell division maintains populations, tissue repair needs new cells via mitosis, and tumours grow through mitotic proliferation (per cell cycle biology).

Why the others are wrong:

• A includes 1 and 2, which do not depend on mitosis.
• B includes 1 and 2 but omits mitosis-reliant 4 and 5.
• C includes 2 but excludes stem cell impact (3).

Final answer: D