In a Research at the University of Warsaw,Lewicki Asked Students

In a research at the University of Warsaw,Lewicki asked students to choose which person in two photographs looked friendlier and found that their choices were almost always influenced by whether or not the photographs

A) were of men or women.
B) looked like their own friends.
C) were in colour or black-and-white.
D) reminded them of friendly or unfriendly experimenters.