Please choose the correct answer to the question: Plants in a forest need to obtain nutrients from the soil to survive. How do most of the nutrients get back in the soil once the forest plants have used them for growth?

Answer1: Organic matter recycles from dead organisms. Answer2: Commercial fertilizers are applied by humans. Answer3: Solar radiation reaches the ground surface. Answer4: Rainwater drips off of living organisms.

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