Please choose the correct answer to the question: The part of the rock cycle that transforms compressed rock formed from sea organism shells into a harder, denser rock is

Answer1: igneous rock becoming sedimentary rock. Answer2: igneous rock becoming metamorphic rock. Answer3: metamorphic rock becoming igneous rock. Answer4: sedimentary rock becoming metamorphic rock.

Answer format: answer1/answer2/answer3/answer4
Answer: answer4