Heat causes a protein to unfold because it increases one or more of these types of energy in the atoms in the protein, thus disrupting the weak interactions that keep the protein in its properly folded state.

a. translational
b. vibrational
c. rotational

Vibrational and Rotational

Explanation:

The property of heating can make protein to melt or it makes it to unfold beacuse heating helps in increasing the vibrational and rotational energy of atoms in the protein.This disrupts the weak interaction, present in the protein and which helps the protein to be in folded state.

Vibrational energy is the energy present in the vibrating system due to the vibration of the atoms in a molecule .

Rotational energy is the energy is in the form of kinetic energy.

It is due to the rotation of an object.