Cottonseed oil has a high proportion of polyunsaturated carboxylic acids. During the manufacture of margarine from this oil, the $\text{C=C}$ double bonds in the unsaturated carboxylic acids are hydrogenated. Which reagents and conditions would be suitable for carrying out this hydrogenation reaction?
- A$\text{H}_2$ gas, nickel catalyst, $400\,^{\circ}\text{C}$
- B$\text{LiAlH}_4$ in dry ether
- C$\text{NaBH}_4$, aqueous solution
- Dsteam, concentrated $\text{H}_2\text{SO}_4$, $300\,^{\circ}\text{C}$ and $60\,\text{atm}$ pressure