Final answer:
After research and exploration, Molly should next Build a Model, which means creating a tangible prototype of the chosen dog collar design for further evaluation and refinement.
Step-by-step explanation:
After Molly has completed her market research, focus groups, and evaluated her options for a new dog collar design, the next step in the product development process is to Build a Model. This involves taking the chosen design concept and turning it into a tangible prototype. At this stage, it is essential to ensure that the design meets all the predefined requirements and constraints. Molly can then use this prototype for further testing and evaluation, which may lead to subsequent iterations and improvements of the product design. The phase called Explore Possible Solutions encompasses the evaluation of potential designs, and once this phase is complete and a solution is selected, the focus shifts to prototype development. This is where the envisioned design becomes a concrete, testable model that can undergo thorough assessment and refinement as needed.