Which of the Following Reactions Isomerizes Cis Double Bonds to Trans

Which of the following reactions isomerizes cis double bonds to trans double bonds in fats and oils?

A) saponification with $\mathrm{H}_{2} \mathrm{O}, \mathrm{NaOH}$
B) hydrogenation with $\mathrm{H}_{2} / \mathrm{Ni}$
C) ozonolysis with $\mathrm{O}_{3}$
D) reduction with $\mathrm{LiAlH}_{4}$