It isn't, report it, please. :)

In the choice of the definite conjugation olvasom rather than the indefinite olvasok.

Since the definite conjugation was used, there must necessarily be a definite third-person direct object: "him, her, it, that, the book, the newspaper, ....".

None was mentioned explicitly, so it's not "the book" or "that"; "it" is probably the best translation in English here.