Answer:
Hydrology.
Step-by-step explanation:
Hydrology may be defined as the study of the movement of the water and its distribution and quality of water. Hydrologists work in the field of the hydrology.
The hydrology includes the study of lakes, seas and oceans. The quality, quantity and chemistry of water in lakes is included in the study of hydrology. Hence, hydrology deals with the study of great lakes.
Thus, the correct answer is option (A).