The answer is going to be c.
I think the first option is the right one
The process of weathering is the most likely to cause metamorphic rocks to change into sediments or magma.
Basically, the Metamorphic rocks is changed to its form from sedimentary rocks through a process called weathering.
The weathering process entails a breaking down of through agent like water, ice, acids, salts, plants, animals etc
Therefore, the process of weathering is the most likely to cause metamorphic rocks to change into sediments or magma.
Read more about weathering
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Rainy. it's lightly raining right? Lol Jk don't put that.