M: The Greek alphabet must have been invented by some individual who knew the Phoenician writing system and who wanted to have some way of recording Homeric epics and thereby preserving expressions of a highly developed tradition of oral poetry.
M's Hypothesis
The Greek alphabet must have been invented by someone who knew Phoenician writing and wanted to record Homeric epics, thereby preserving oral poetry traditions.
P's Conclusion
That's crazy. It wasn't invented by someone who wanted to record Homeric epics.
P's Evidence
If you knew the epics well enough to write them down, you have no need for reading them. And you wouldn't be able to pass this off to someone else for them to read, since no one else knows this alphabet you just invented.
Evaluate
The word 'hypothesis' should always make us think in terms of Explain Curious Fact type ideas.
M is trying to solve the causal mystery of who invented the Greek alphabet.
P is disputing M's hypothesis. Is P offering an Alternative explanation? No. Is P undermining the plausibility of M's idea? Yes!
P is saying that theory makes no sense because what purpose could it have served for someone to invent an alphabet as a way to write down Homeric epics (that they already knew by heart and that no one else could read)!
Goal
Let's look for anything that matches. It might say something like