help math i dont under stand will give est if right if wrong u get report and no points

Which of the greatest common gcf of 32 and 48 a 16 b 96 c 8 d 32

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!