Mr ElNino.
B. is the right answer IF the question is refering to (what I was always told was) an ALL FLYING TAIL. IE L1011 Tristar.
To clarify, have a look at the FIN and RUDDER set up on the DC10, 747SP and B777. They have vertical examples of ALL FLYING TAILS. Strictly speaking they are called DOUBLE ACTING but the gist is the same. For a given area and movement of a control surface, a double acting device is far more effective. The DC10 only had a small rudder as the no.2 engine was in the way, the 747SP needed a larger control effect as the moment arm was smaller (shorter fuselage). As for the B777, I think that required a partial double acting rudder to help in the event of an engine failure at take off power.
As others have said, A FLYING TAIL has no elevator. F4 Phantom is the classic example.
The other devices described by various others here, are standard TRIMMABLE HORIZONTAL STABILISERS. EG B747 A330 etc.
I may be wrong and will take any correction on the chin like a good egg.
