In Cases of Reserve Troncal, the Reservista Can Sell the Property

In cases of reserve troncal, the reservista can sell the property subject of reserva. True or false?

A) True, but subject to resolutory condition, hence, can rescind the conrtact.
B) False, because he/she is not the owner as he holds the property merely in trust for the reservatarios.
C) True, because having a title over it, the buyer can just rely upon the title under the mirror doctrine.
D) True, because from the moment of death of the descendant propositus, the reservista acquired ownership over the property subject of reserva.