Simplify completely quantity 6 x squared minus 54 x plus 84 over quantity 8 x squared minus 40 x plus 48 divided by quantity x squared plus x minus. (2 points) Select one: a. 2 open parentheses x minus 3 close parentheses over 3 open parentheses x minus 2 close parentheses b. 2 open parentheses x minus 2 close parentheses over 3 open parentheses x minus 3 close parentheses c. 3 open parentheses x minus 3 close parentheses over 2 open parentheses x minus 2 close parentheses d. 3 open parentheses x minus 2 close parentheses over 2 open parentheses x minus 3 close parentheses