Answer:
The correct answer is : Yes, the offer was revoked by Katherine.
Step-by-step explanation:
Even if Paul replied Katherine with the acceptance to the first offer, he used a different means of communication to do that -e-mail v. mail. In addition, Katherine sent the revoke by mail -as in the initial offer- before Paul sent his e-mail. So, there is enough proof on Katherine's end that she didn't want to proceed with the offer before Paul confirmed his agreement on the terms. In that sense, Katherine did revoke the initial order.