Answer :
The answer u r looking for is- A, all of the above. Hope I’ve helped ;)
The following changes may occur during metamorphism - a) all of the above
Metamorphism
The changes in mineralogy, textural, or chemical properties of rocks are due to changes in elevated pressure and temperature conditions. metamorphism takes place at a temperature greater than 300 degrees celsius and pressure greater than 1-2 kbar.
During metamorphism due to an increase in pressure, the rock becomes compact and usually exhibits foliation. Also due to elevated temperature conditions, some of the minerals may recrystallize which means that some preexisting minerals may become large.
This is common in metamorphic rocks like marble and quartzite.
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