Which Method of Learning is The Teacher Encouraging in The Class?

A teacher suggests that students make a table recording the number of buckets of water used by a student of buckets of water used by a students in a week. After this activity, she initiates a discussion on water usage and conservation. Which method of learning is the teacher encouraging in the class?

1. Deductive Method
2. Problem solving method
3. Case-study method
4. Enquiry method