If you were riding on a train, which of the following would look as if it is not moving? A. the conductor walking by you. B. a building you are passing
C. a flying bird
D. a person sitting next to you

the correct answer to this question is 2

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.