Which chemical equation shows that no atoms are lost during a chemical reaction?

A. 8Fe+s8-->Fe5
B. 8Fe+8S8--> 8FeS
C. Fe+8S8--->FeS
D. 8Fe+S8--->8FeS
Is the answer A?

2 answers

It can't possibly be A. Why?
There are 8 atoms Fe on the left and 5 on the right. There are 8 atoms S on the left and none on the right.
Don't guess. Count the atoms on the left and see if that number is on the right. If not that one can't be the answer.
it is D