Select the most appropriate option to fill in the blank.

_____ rivers have water throughout the year.

Perennial

The most appropriate option to fill in the blank is:

☀ Perennial

The sentence would read: "Perennial rivers have water throughout the year."

Explanation: "Perennial" means lasting or existing throughout the entire year, which fits the context of rivers that have water consistently. The other options don't fit the context:

• Ephemeral: This means lasting for a very short time, and it's the opposite of what the sentence is describing.

• Seasonal: This means occurring only during a particular season, and it's not a suitable choice for rivers that have water throughout the year.

• Chronic: This means persisting over a long period of time, often referring to medical conditions, and it doesn't fit the context of describing rivers.