How do mountainous regions experience gravitational collapse?

How do mountainous regions experience gravitational collapse?

a.Mountains that have risen to extreme heights experience uplift in the upper crust and subsidence in the lower, ductile crust.

b.Mountains that have risen to extreme heights experience ductile spreading at depth and normal faulting as well as subsidence in the upper, brittle portion of Earth’s crust.

c.Mountains that have risen to extreme heights experience ductile spreading at depth and reverse faulting as well as subsidence in the upper, brittle portion of Earth’s crust.

d.Mountains that have risen to extreme heights experience more compressional forces, which breaks the brittle rocks on the crust, causing massive rockfalls until the mountains cease to exist.

e.Mountains that have risen to extreme heights become so heavy that the crust that supports them sinks deeply into the mantle below, which significantly reduces the elevations of the mountains.