In this question, we have a reaction between Potassium hydroxide, KOH, and Iron (III) chloride, FeCl3, and the complete and balanced reaction for these two compounds is:
FeCl3 (aq) + 3 KOH (aq) ---> 3 KCl (aq) + Fe(OH)3 (s)
Based on this reaction and observing the physical state of each compound, we can determine that the solid precipitate for the reaction is FeCl3, the 3rd option is correct.
