Antonie van leeuwenhoek first observed which of the following? brain cells red blood cells viruses bacteria

According to Wikipedia: He was the first to document microscopic observations of muscle fibers, bacteria, spermatozoa, red blood cells, crystals in gouty tophi, and blood flow in capillaries. So the answer would be: Red Blood Cells

1 true

2 true

and 3 true im assuming these are true or false. hope this