Which of the following represents the correct conversion of propanone into 2-methyl-2-propanol?
a) Propanone + H₂/Pd-C → 2-methyl-2-propanol
b) Propanone + H⁺/Cr₂O₇²⁻ → 2-methyl-2-propanol
c) Propanone + H₂SO₄/AlCl₃ → 2-methyl-2-propanol
d) Propanone + H₂/Ni → 2-methyl-2-propanol