The Vref at Flaps 40 at MLW 66.360 kg is more then 140 kts. But that is only to decrease the ptich to avoid tail strikes in the flare. Even more visible when comparing the Vref´s of Flaps 30 and Flaps 40. Difference is around 7 kts on the 800 and only around 3-4 kts on the 700. So basically the Vref of the 800 is around 1.4 VS due to the facts mentioned above, thats also why turning with more then 15* bank in the lower yellow hollow bar is no big deal aerodynamically. (but then again commonality to the classic would be lost..) It is for sure on the 400.
So to get back to the subject, if VS 1.3 is taken then it would be easily under 140 kts, making it Cat C.
Regards repulo