Final answer:
Answer d is correct, explaining that children sometimes use familiar but less efficient strategies even after learning better ones. This reflects the learning process where understanding concepts is crucial, not just memorizing formulas.
Step-by-step explanation:
The question pertains to the strategies that children use to solve math problems and whether certain assertions about these strategies are true. The correct answer to the student's query is d. Children occasionally use less efficient strategies after learning more efficient strategies. This reflects the complex nature of learning and understanding in mathematics, where students might revert to familiar methods despite knowing more efficient ways. Learning math is not simply about memorizing formulas, but about understanding underlying concepts. By focusing on problem-solving strategies, such as identifying knowns and unknowns or checking the reasonableness of an answer, students can internalize mathematical concepts and effectively apply them to different scenarios, thereby overcoming an over-reliance on memorization.