Correct Answer: Hydrophobia

Solution : The correct answer is the first option.

Explanation: Hydrophobia specifically refers to an irrational and persistent fear of water. It is a concise and precise term that serves as a one-word substitute for the given group of words.

The meanings of the other options are as follows:

• Bibliophobia refers to a fear or aversion to books.
• Microphobia refers to an irrational fear or aversion to small things or microscopic entities.
• Botanophobia refers to an irrational fear or aversion to plants or plant life.

Therefore, the correct answer is hydrophobia.