I found this so this might help you
A or c probably I think a tho
3/5 times 5/3x = 8*3/5. X=24/5 simplified would be x= 4.8 L.
need 0.500 x 0.125 = 0.0625 moles of NaOH. The molecular weight is 23+16+1 = 40, so 0.0625 x 40 = 2.5 grams will do the trick.