The correct option is 3.
The given expression is
The factors of each term are
The common factor is 8.
Take out the common factor from the given expression.
Therefore option 3 is correct.
8 (3/4a) - 8
The above expression can be written as:
Since 8 is a common factor here which is multiple of 3/4a as well as 1 therefore taking 8 as a common factor from whole equation,
Therefore option (3) is the correct answer.
I think it's true but not 100% sure :)