What needs to be emphasized in this step when reading? "Turn the two-bottle assembly over, and place the assembly on a table with the filled bottle on top. Watch the water slowly drip down into the lower bottle.... Now, rapidly rotate the bottles in a horizontal circle a few times. Observe the formation of a funnel-shaped vortex..." a. rapidly rotate the bottles in a horizontal circle c. both A and B b. Watch the water d. neither A nor B

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