The sentence contrasts seemingly shallow, preachy statements with poems that actually have substance, so we need two words meaning "preachy/sermon-like."
- Hortatory means urging or exhorting, often in a didactic or moralizing way, like a speech that strongly encourages certain behavior.
- Homiletic means relating to sermons or homilies, especially moral or religious instruction, and by extension "sermonizing" or preachy.

So the correct pair is C. hortatory and F. homiletic.