The answer is C, ethos. This excerpt appeals to ethics.
My last answer was deleted for being pointless, but I had to add more letters for the correct, succinct answer to be published. The right answer is "a sentence".
Answer:
If you can keep your head when all about you
Are losing theirs and blaming it on you;
If you can trust yourself when all men doubt you,
But make allowance for their doubting too:
Explanation:
In general, classical drama does not have to include irony or soliloquy, but it should be noted that there are many shades of grey with it comes to classical drama, and the rules were frequently "bent".