It is known that A and C are colorless gases, and the states and colors of B and D are uncertain. According to the description of A, increasing the amount of B will deepen the color of the equilibrium system, which proves that B must be a gas. Reason: B may be a colored gas, which will lead to the color deepening of the system. Even if B is a colorless gas, the balance will move to the right due to the increase of the concentration of B, which will lead to the increase of the concentration of colored gas D and deepen the color of the system, so A is correct.

Increasing the pressure balance shows that the gas volume is unchanged before and after the reaction, and m+n is not necessarily equal to p+q when the states of B and D are unclear, and B is incorrect.

With the increase of temperature, the conversion of A decreases and the equilibrium shifts to the left, indicating that the positive and negative reactions should be exothermic and C is incorrect.

If B is a gas, increasing the amount of A will reduce the conversion rate of A and increase the conversion rate of B. D is correct.

I think this topic is right!