Which One of the Following Best Describes How Talc Deposits

Multiple Choice

Which one of the following best describes how talc deposits might form?

A) reaction of hydrothermal fluids with quartz- rich sandstones during contact metamorphism
B) high pressure metamorphism associated with impact of an asteroid or large meteorite
C) reaction of olivine and pyroxene with hydrothermal fluids during regional metamorphism
D) dehydration of gypsum and limestone during contact metamorphism