Please help me with this question

The rate at which molecules water and oxygen can enter a cell is determined by the-

Which experiment would most likely contain experimental bias ?

Draw the farm's ppf for corn and beef. draw a point that shows an inefficient combination of corn and beef. label ita. draw a point that shows an unattainable combination of corn and beef. label itb. draw a point that shows an efficient combination of corn and beef. label itc.