The correct answer is option 2 - Leeuwenhoek. Hooke, Leeuwenhoek, Purkinje, and Virchow were all notable scientists in the field of biology, but Leeuwenhoek was the first to state that all living cells arise from pre-existing cells.

Option 1 - Hooke: Although Robert Hooke made significant contributions to the field of biology, such as discovering and naming cells, he did not specifically state that all living cells come from pre-existing cells.

Option 2 - Leeuwenhoek: Antonie van Leeuwenhoek, a Dutch scientist, is often credited as the first to observe microorganisms and single-celled organisms under a microscope. He was also the first to state that life only comes from pre-existing life, thus supporting the concept of biogenesis which opposes the previously held belief of spontaneous generation.

Option 3 - Purkinje: Jan Evangelista Purkinje was a Czech biologist known for his many contributions to various fields of science. However, he did not make the specific statement that all living cells arise from pre-existing cells.

Option 4 - Virchow: Rudolf Virchow, a German physician, is known for his advancements in the field of