Select the option that can be used as a one-word substitute for the given group of words.
A story intended to teach moral lessons

The correct option is Parable.

Let's understand the meaning of the given phrase and analyze each option:

Given phrase: "A story intended to teach moral lessons"

1. Parable: A short, simple story designed to illustrate or teach a moral, religious, or spiritual lesson (e.g., the parable of the Good Samaritan). Therefore, this is the correct one-word substitute.

2. Parboil: To partially cook food by boiling it briefly in water.

3. Parole: The temporary or permanent release of a prisoner before the completion of a sentence, on the promise of good behavior.

4. Parasite: An organism that lives in or on another organism (its host) and benefits by deriving nutrients at the host's expense.

Hence, the correct one-word substitute is Parable.