If students are not able to follow, the teacher should

When students cannot follow, all three help: giving a prompt explanation, simplifying the matter, and illustrating with examples.

Giving a prompt explanation alone addresses only immediate clarification.

Making the matter easy alone reduces difficulty but may lack illustration.

Illustrating with examples alone gives concreteness but not the other supports.

Varied strategies used together reach learners with different needs.

Examples and simplification move teaching from the abstract to the concrete.