The scenario that describes mitosis in action is "A skin cell repairing itself after a cut."
Mitosis is the process by which a cell divides its nucleus and genetic material to create two identical daughter cells, and this process is essential for growth, tissue repair, and asexual reproduction in multicellular organisms. The other options involve different biological processes: the liver cell preparing to produce enzymes relates to metabolism, the fusion of sperm and egg is related to fertilization (and involves meiosis), and a virus undergoing the lytic cycle involves viral replication, not cellular division.