How is Brownian motion caused?

1.	How is Brownian motion caused?
A.	Through temperature fluctuations within the liquid phase
B.	Through attraction and repulsion between the charges on the colloidal particles
C.	Through collision of molecules between the colloidal particles
D.	Through pressure variations within the liquid phase
Answer» D. Through pressure variations within the liquid phase

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How is Brownian motion caused?

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