Humans can see objects as small as 0.1 mm. Leeuwenhoek's best microscope could magnify objects to 300X. Which of the following would be invisible using Leeuwenhoek's microscope?
A) Poliovirus, 30 nm B) Escherichia coli, 1 μm X 4 μm C) Pandora virus, 0.5 mm X 1 mm D) Red blood cell, 8 μm