A, there are two kinds of competition results between organisms: one is to be eliminated, such as the organisms represented by curve ① ③; The other is the coexistence of the two, such as cattle and sheep on the grassland, a is reasonable;

The amount of alcohol produced at point B and point A is less, and the closed yeast culture solution still contains a certain amount of oxygen, so the yeast can still carry out aerobic breathing for a period of time after point A, and the expression of B is the most unreasonable;

C, the way of absorbing inorganic salts by plant roots is active transportation, which requires carriers to consume energy, and the rate increases with the increase of oxygen concentration, and then C is reasonable because the number of carriers will not increase;

D. After the human body is infected by virus, the body produces antibodies through humoral immunity, and the antibodies specifically combine with antigens to form cell clusters or precipitates, and D is reasonable.

Therefore, choose: B.