Dissolving sugar II

This task is about the surface area of a substance.
Surface area is how much area of a substance is exposed to the outside.
crushed grains of sugar
crushed grains of sugar
grains of sugar
grains of sugar
sugar cube
sugar cube

Question

a)  Which type of sugar has the most surface area?
    • crushed grains of sugar
      crushed grains of sugar

    • grains of sugar
      grains of sugar

    • sugar cube
      sugar cube

Question

b)  Which type of sugar would dissolve most quickly in water? 
    • crushed grains of sugar
      crushed grains of sugar

    • grains of sugar
      grains of sugar

    • sugar cube
      sugar cube

Explain why the sugar you chose would dissolve most quickly.