Answer: the statement that best explains why Greg's hands get warm as he holds a bowl of hot soup is that the thermal energy from the soup moves to Greg's hands.
Explanation:
Thermal energy is the kinetic energy that the particles (atoms, molecules or ions) of a substance posses.
When hot substance (the bowl of hot soup that Greg holds) gets in contact with a cool substance (Greg's hands) part of the kinetic energy of the particles in the hotter substance is spontaneoulsy transferred to the cooler substance. This transferred energy is called heat energy.
There are three different mechanisms through which the heat energy transference is explained: conduction, convection and radiation, which are not necessary to explain here.
You just need to know that the hot soup transfers part of its thermal energy to the bowl walls, with which the soup is in direct contact, and the (now) hot bowl transfers part of its thermal energy to Greg's hands, which now get warm.
