[单选题]
A container holds N molec2c d* bssmn:s;da (3fg1 hw9kmules of an ideal gi +ymxn,91xuu as at a given temperature. If the number of moley+9xx unm i1u,cules in the container is increased to 2N with no change in temperature or volume, the pressure in the container
A. doubles.
B. remains constant.
C. is cut in half.
D. none of the above