Which of the following factors would tend to increase membrane fluidity?

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below are the choices, the answer is A> 

A) 
a greater proportion of unsaturated phospholipids
B) 
a greater proportion of saturated phospholipids
C) 
a lower temperature
D) 
a relatively high protein content in the membrane
E) 
a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses