Tom H wrote:
K is correct. Water can't get into D and therefore not into G. The water level in F can't get higher than the rim of H, (water seeks its own level so will just overflow H getting no higher than H's rim). That leaves K as the only one, (except H which is lower than K, with water entering but without an exit other than overflowing.
Oops! I didn't notice that H is blocked.