Please choose the correct answer to the question: Measuring is a way to collect data; what is an example of this?

Answer1: pouring water into a gallon jug to save for later Answer2: pouring milk into a half cup to see how much is left Answer3: making sure that a blanket is warm enough for the night Answer4: noticing how long a cat's tail is

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