Investigating and classifying different objects is an example of:

The 5E instructional model organises inquiry-based learning into five phases: Engage, Explore, Explain, Elaborate, and Evaluate. The Explore phase is the stage where learners directly investigate materials, observing, manipulating, comparing, and sorting or classifying objects, to build first-hand experience with a phenomenon before any formal explanation is introduced.

The stem describes exactly this activity: investigating different objects and classifying them into groups. This hands-on, observation-driven investigation that precedes formal explanation is the defining action of the Explore phase, so the match is Explore.

• Engage only creates initial interest or poses a question to capture attention; it does not involve hands-on investigation or classification of objects.

• Explain is the phase where learners articulate and formalise understanding using vocabulary and concepts, after the exploration has already happened, so it is not the investigating/classifying step itself.

• Elaborate extends an already-introduced concept to new situations or deepens it with further detail; it presupposes the concept has already been explored and explained.

Because investigating and classifying objects is the hallmark of hands-on exploration prior to formal explanation, the correct match is Explore.