What Effect Would the Intrusion of a Magma Body Have

Multiple Choice

What effect would the intrusion of a magma body have on the depth to the "oil window",and why?

A) None.
B) The depth to the oil window should increase because the magma is migrating upward and thereby decreasing crustal pressures
C) The depth to the oil window should decrease because the magma is bringing heat closer to Earth's surface.
D) The depth to the oil window should increase because the water in the magma will cool the nearby rock.