Consider the equilibrium shown here:

$CaC{O}_3(s)CaO(s)+C{O}_2(g)$

What would happen to the system if more $CaC{O}_3$ were added

$\backslash$table$[[,$More CaO would be produced.$],[,\backslash$table$[[$The concentration of $C{O}_2(g)$ would$],[$decrease$.]]],[$c$.,$The amount of $CaC{O}_3$ would decrease.$],[$d$.,$The pressure would increase.$],[,$Nothing would happen.$]]$