The correct option is C Landsteiner
Karl Landsteiner discovered ABO blood group. ABO grouping is based on the presence or absence of two surface antigens (chemicals that can induce immune response) on the RBCs namely A and B.
Antonie van Leeuwenhoek who is credited with the discovery of bacteria.
A. S. Wiener discovered the Rh factor along with Karl Landsteiner. Rh factor, also called Rhesus factor, is a type of protein found on the outside of red blood cells.
Zacharias Janssen is credited with inventing the microscope.