Spherical Particles of Density 1

Spherical particles of density 1.6 g/cm³ are shaken in a container of water (viscosity = 1.0 × 10−³ N⋅s/m³) .The water is 10.0 cm deep and is allowed to stand for 35 minutes.What is the radius of the largest particles still in suspension at that time?
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A) 6 × 10−⁶ m
B) 7.3 × 10−⁶ m
C) 2.8 × 10−⁶ m
D) 2 × 10−⁶ m
E) ​4.7 × 10−⁶ m