Which of the following claims is true for the sentence 'I ate because I was hungry'?

The sentence is not an argument but an explanation.

'I ate because I was hungry' reports why an accepted fact occurred.

That I ate is not in dispute and is not being proved.

The clause after 'because' gives the cause, not evidence for a doubtful claim.

An argument instead offers premises to establish a conclusion still to be accepted.

Because it accounts for an agreed fact rather than proving one, it is an explanation.