Identify the more stable stereoisomer in the following pair, and then, select the best reason that explains your choice: cis-1-isopropyl-2-methylcyclohexane.

a) Isomer 1; Steric hindrance is minimized.
b) Isomer 1; Dipole-dipole interactions are maximized.
c) Isomer 2; Steric hindrance is minimized.
d) Isomer 2; Dipole-dipole interactions are maximized.