Which Is Not a Piagetian-Based Implication for Teaching

Which is not a Piagetian-based implication for teaching?

A) Teachers should provide answers rather than letting learners find them on their own.
B) The best teaching experiences are those slightly ahead of a child's current level of thinking.
C) In order to promote learning, teachers should provide materials with which learners can make their own discoveries.
D) Letting learners make mistakes is okay, as cognitive development tends to occur when children become aware of errors in their own thinking.