Aldehyde And Ketone

From among the following, identify the compound which forms two moles of a ketone on ozonolysis.

[A] 2,3-Dimethylbutane.

[B] 3-Methyl-1-pentene.

[C] 2,3-Dimethyl-2-butene.

[D] 2-Methyl-2-pentane.