help on last module!

[Karina Koo 2H]

The photosynthesis reaction, 6 CO2(g) + 6 H2O(l) ⇌ C6H12O6(aq) + 6 O2(g), is endothermic. What effect will the following changes have on the equilibrium composition.
a) Water is added.
b) The partial pressure of CO2 is decreased.

A. a) Decrease [C6H12O6] and [O2], b) Decrease [O2]

B. a) Decrease [C6H12O6] and [O2], b) Increase [O2]

C. a) Increase [C6H12O6] and [O2], b) Decrease [O2]

D. a) Increase [C6H12O6] and [O2], b) Increase [O2]

i dont get part A. If water is not calculated into K since it is a liquid, why should it change [C6H12O6]?

[Nicolette_Canlian_2L]

I have the same question. Does it have anything to do with the volume increasing since liquid water is placed into the reaction? Would this therefore decrease the pressure of the system? I don't understand how water at its liquid state would be incorporated into the equilibrium constant.

[Ava Kjos 1D]

This has to be a mistake with the question. Adding water would not change the equilibrium concentration.