The following data are given at 1000 K: CO(g) + H₂O(g) ⇌ CO₂(g) + H₂(g); Δ_rH° = -42 kJ mol^-1; K_c = 0.66. After an initial equilibrium is established in a 1.00 L container, the equilibrium amount of H₂ can be increased by 

(a) Adding a catalyst; 

(b) Increasing the temperature; 

(c) Transferring the mixture to a 10.0 L container; 

(d) In some way other than (a), (b), or (c).