Three ways to convince people

The statement gives a specific number, 15%, and refers to studies that could be checked.

Logos is defined as giving a reason or fact, especially statistics, rather than an emotional appeal or trust-building claim.

The statistic gives the reader a rational reason to believe sleep improves scores, not a feeling or a claim about trustworthiness.

Since the sentence relies on checkable data, it is logos, matching the choice “Logos, because it presents a statistic that could be checked and verified”.

There is no emotional image, story or feeling-based language in the statement, so pathos does not fit.

The statement does not mention an expert's credentials or reputation, so it is not building trust in a person.

The words used are neutral and factual, not emotionally charged word choices like 'skinny' versus 'slim'.

Only the statistic-based reasoning explanation remains, confirming the choice “Logos, because it presents a statistic that could be checked and verified” as correct.

The speaker mentions being a firefighter with 20 years of experience before stating an opinion.

Ethos is built when a speaker shows expertise or experience to make the audience trust them.

The mention of experience is meant to make the listener believe the claim because of who is speaking, not the evidence given.

This matches ethos, so the choice “Ethos, because it highlights the speaker's expertise to build audience trust” is correct.

No specific checkable fact or statistic is given about candles, so this is not logos.

There is no vivid emotional scene or feeling-based description, so pathos is not the main appeal.

While 'dangerous' has some charge, the sentence's main strategy is establishing the speaker's credentials, not word choice alone.

The credential-based trust-building confirms the choice “Ethos, because it highlights the speaker's expertise to build audience trust” as the best answer.