Answer:
E - Aqueduct
Step-by-step explanation:
All of the following words have a meaning somehow connected to water. The word that is missing in the following sentence is obviously a noun (we can ask - What has the drought left empty? The local what?), so we can eliminate all words that are not nouns.
To dehydrate is a verb.
Hydroelectric, aquatic, marine, and maritime are adjectives.
The remaining words are nouns.
A hydrant is an outlet from a fluid main that consists of an upright pipe with a valve attached from which fluid (like water) can be tapped. It is not used by farmers to water crops.
An aqueduct is a watercourse constructed to carry water from a source to a distribution point far away. It can be used by farmers to water crops.
An aquarium is the same as a fish tank.
An aquifer is an underground layer of water-bearing permeable rock, rock fractures, or unconsolidated materials, such as sand.
A marina is a small port designed for small pleasure boats.
Thus, the correct option is E - Aqueduct.