Larry made this picture to represent a chemical reaction: There are two circles on the left, one white and the other gray, and there is a plus sign between them. The white circle is labeled X and the gray circle is labeled Y. An arrow pointing right is shown on the right of the circles. Two circles, one white and the other gray are shown on the right. A small portion of the two circles overlap and the label below the circles is XY.

Which of the following statements best explains the type of chemical reaction represented by Larry's picture? (5 points)
It represents a synthesis reaction because two reactants form one product.
It represents a synthesis reaction because the total mass of the product is less than the mass of the reactants.
It represents a decomposition reaction because one reactant breaks apart and forms two products.
It represents a decomposition reaction because the same atoms are present in the reactants and products.