Select the equation that has the following mole ratio:

2:6:2:3

a
Li3PO4 + 3KCl → 3LiCl + K3PO4

b
NaOH + HCl → NaCl + H2O

c
Na2O + CaCl2 → 2NaCl + CaO

d
2Al + 6HCl → 2AlCl3 + 3H2