Assume a satellite rotates in an ellipse motion about the center of the earth. Then during the process of the motion which one is correct for the satellite to the center of the earth ( ).
选项：

A:Both angular momentum and kinetic energy are conserved.;
B:Both angular momentum and mechanical energy are conserved.;
C:Angular momentum is not conserved, while mechanical energy is conserved.;
D:Both angular momentum and momentum are not conserved.;
E:Both angular momentum and momentum are conserved.