Answer:
Option B
Explanation:
Among the give salts
FeCl3 is acidic in nature i.e., have an acidic solution as it is the salt of a weak base and strong acid.
Al(CN)3 and Pb(CH3COO)2 are the salts of a weak acid and weak base.
CH3COOK is the salt of a strong base and weak acid.
Hence, the solution of CH3COOK will be most basic because of the following reaction.
CH3COOK + H2O $\rightleftharpoons$ CH3COOH (Weak acid) + KOH (Strong base)