Choose the letter A, B, C or D to complete the sentences

He wants to become a __________ motorist in the future.

A. dancing

B. racing

C. herding

D. drawing

xy + x + y = 2

<=>  x(y+1) +( y+1) -1 = 2

<=>  (x+1)(y+1)          =3

vì x,y thuộc Z

nên (x+1)(y+1) = 1.3 = 3.1=(-1)(-3)=(-3)(-1)

ta có bảng sau

=>