What is notable about the depth of Mytäjäinen pond in Lahti, Finland?

A. It is the deepest pond in Finland, with a maximum depth of 50 meters
B. It is relatively deep, with a maximum depth of 11 meters
C. It is average for a pond of its size, with a maximum depth of 5 meters
D. It is very shallow, with a maximum depth of 1 meter
Answer: 