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50 points for this

Explanation:

When a molecule of oxygen (O2) is combined with an atom of carbon (C), they form CO2, or carbon dioxide. The carbon and oxygen are the reactants in this chemical reaction; the CO2 is the product.

it is b that is the answer.

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.