Answer:
it is option 2.
Explanation:
when balancing equations, both sides need to have the same number of the element.
4As + 3O2 - -> 2As2O3
4 as. 4 as (2×2=4)
6 o (because 3×2=6) 6 o (2×3=6)
since there are the same amount of each element on both sides, the equation is balanced.
hope this helps:)
