Not linear or porportional
The red marbles are 3/10 of the total.
The blue ones are 5/10 of the total.
The green ones are 2/10 of the total.
Of these, 5/10=1/2=(1×4)/(2×4)=4/8
Therefore, five tenths is equivalent to four eighths.
we are given

we can see that 3 is not present in the options on exponent
so, we will try to get rid of exponent 3
we can write it as

now, we know that

so, we can plug it
and we get

so, option-2......................................Answer