Answer:
D) Pix must have knowledge of all material facts relating
Explanation:
If the contract is beneficial for Pix, then they will want to ratify it. Unless Sky is aware that Able was not authorized to sign contracts on behalf of Pix, they probably wouldn't even tell them about what really happened. Although, Pix will want to know all material facts relating to the contract at the time it is ratified in order to verify if it is really good for them.