If a Sedimentary Basin Is Tectonically Subsiding,how Would the Depth

Multiple Choice

If a sedimentary basin is tectonically subsiding,how would the depth of the oil window be affected,and why?

A) The depth of the oil window would decrease because hot fluids produced from diagenesis of basin sediments would increase hydrocarbon temperatures.
B) The depth of the oil window would increase because fluids produced from diagenesis of basin sediments would prevent or buffer any rise of hydrocarbon temperatures.
C) The depth of the oil window would decrease because the basin bottom would be closer to the mantle and heat of Earth's outer core.
D) The depth of the oil window would increase because the geothermal gradient in the subsiding basin would lead to cooler rocks being found at greater depths.