Which of the following are deductive arguments？

A、All dogs are mammals. All mammals have kidneys. Therefore all dogs have kidneys.;
B、Since all squares are rectangles, and all rectangles have four sides, all squares have four sides.;
C、All science teachers are smart, since all my physics teachers, chemistry teachers and biology teachers are smart.;
D、The sun is a star; the sun has planets; therefore some stars have planets.