In a chemical equation, the sum of the masses A. Of the products is less than the reactants
B. Of the products is more than the reactants
C. Of the products is equal to the reactants
D. Of the products is not equal to the reactants

In a chemical equation, the sum of the masses of the products is equal to the reactants.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.  

it has both hydrogen and oxygen