The answer must be C because that's what the paragraph mostly talks about
A rhyming poem
For example:
Roses are red
violets are blue
I love you so much
I hope you do too

Because the ladder was in flat position not in slant.

Answer: tone
Tone is the attitude an author expresses through words.
Some people would think that the answer would be mood, but mood would be a whole different example. Mood is the attitude through signs of face and actions, tone is by the voice or the words from mouth.