The amine shown is to be prepared by the Gabriel synthesis (potassium phthalimide, then hydrazine). Which halide should be used?

The target shown is 3-methylbutan-1-amine (isopentylamine). The Gabriel route installs the nitrogen on the carbon carrying the halogen without changing the carbon skeleton, so the halide must have the same skeleton: 1-bromo-3-methylbutane. The other halides have different carbon skeletons.