When equal volumes of the following solutions are mixed, precipitation of AgCl (Ksp = 1.8 x 10-10) will occur only with
(a) 10–4 M [Ag+] and 10–4M[HCl]
(b) 10–5 M[Ag+] and 10–5 M [Cl– ]
(c) 10–6M [Ag+] and 10–6 M [Cl-–]
(d) 10–10 M [Ag+] and 10–10M [Cl– ]