According to the Assosiative Property of Multiplication:
you can multiply the any of the two in these three terms then multiply their product to the another one so:
y = 3 ( x + 5 ) ( x - 2 )
y = 3 (X2 + 3X - 10)
y = 3x2 + 9x - 30
the answer is A. y=3x2+9x-30