The reversible reaction shown occurs in a closed system at fixed temperature. $\text{P}(g) + \text{Q}(g) + \text{R}(g) \rightleftharpoons \text{S}(g) + \text{T}(g)$ Once the reaction has attained equilibrium, extra T is introduced. After T is added, which other substances have an increase in concentration?
- AP, Q, R and S
- BP and Q only
- CP, Q and R only
- DS only