Which of the following compounds have exactly three stereoisomers? (Count enantiomers and diastereomers as distinct.)

Rings bearing two identical substituents at 1,2 or 1,3 positions give a meso cis form plus a trans pair, i.e. three stereoisomers; this applies to 1,2-dimethylcyclohexane and 1,3-dichlorocyclopentane. 1,4-Dimethylcyclohexane has only 2 (cis, trans). 1-Bromo-2-chlorocyclopropane has two stereocentres and no symmetry, so $2^2=4$.