Final answer:
Providing a hands-on lab is an effective way for a teacher to help students master a new skill, allowing for experiential learning and practical application of concepts.
Step-by-step explanation:
Among the options provided for helping students master a new skill, C. Providing a hands-on lab is generally considered the best approach. A hands-on lab allows students to engage directly with the material, which can facilitate deeper understanding through experiential learning and practical application of concepts. Assessments also play a role in the learning process by confirming understanding and giving students opportunities to apply what they have learned. Practice problems and performance tasks are further tools that can reinforce key concepts and help students to master new skills by applying them to solve real-world scenarios.