Well it matters what the definition is because their are two definitions of entreated.
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It is a simple sentence because it has one subject and one predicate.
Did you mean to include a link to a story? :)
The speaker in the poem "The first lesson" is C. a parent.
The poem tells a story about a parent and his daughter in a pool or some other water, and the parent is teaching his kid how to swim. Of course, the whole poem is a metaphor - it's not really about swimming, but an important lesson that a parent has to teach his child about life itself.