Please choose the correct answer to the question: Florida has a large supply of phosphate that ancient seas deposited millions of years ago. The phosphate contains the remains of animals that were deposited in layers on the sea floor. Which type of rock did the phosphate become?

Answer1: intrusive igneous Answer2: extrusive igneous Answer3: clastic sedimentary Answer4: organic sedimentary

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