Need chemistry help with a saturated solution of AgCl

Which of the following, when added to a saturated solution of AgCl, will cause a decrease in the molar concentration of Ag+relative to the original solution?1. HCl(g)2. AgCl(s)3. MgCl2(s)Select one:a. 1 onlyb. 2 onlyc. 3 onlyd. 1 and 3 only