Answer: C. It is hydrophobic.
Explanation: Valine is a essential aminoacid used to make proteins, that must be consumed in food. Since valine is an aminoacid, it has an amino group, a carboxyl group and a isopropyl group as a side chain. This isopropyl group is a chain of 3 carbons and by this chain valine is classified as a hidrophobic aminoacid.