Answer:
The correct answer is letter "A": imperfect information; thin market.
Step-by-step explanation:
Liquid markets are those with enough buyers and sellers that keep the balance of supply and demand. The opposite of that scenario is represented by thin markets because they have whether a few buyers or a few sellers.
Thin markets are mostly caused by imperfect information allowing only a reduced number of buyers or sellers having enough resources to correctly make transactions. Price spreads are usually larger in thin markets.