Please choose the correct answer to the question: What is an example of reproduction occurring in adulthood?

Answer1: humans are unable to reproduce until they are legal adults Answer2: eggs are unable to be fertilized before they are dropped Answer3: dogs are unable to have puppies until they are two years old Answer4: cats are unable to produce offspring until they are sexually mature

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