Is (y-3)-(3y+4) equivalent to 4y-7 or 4y+1 or 2y-1 or 2y+y?

Iknow one of the answers is a and maybe b but not 100% sure about b

Rounding  means we are finding the closest  benchmark number. abenchmark number  is one that is easy to  use  in operations and/or quicker to say and write. a  number  line can us  round  by showing the closestbenchmark number. five is the midpoint  between  0 and 10.

The answer should be 6 groups of negative 5. this is because it is negative 5 times 6