Explanation:

The JSON must mirror the OmniScript canvas hierarchy exactly. In the screenshot, Step1 contains Block1, which holds both Text1 and Telephone1, then a nested Block2 for Checkbox1, and finally a sibling Block3 for Multi-select1. Option C places Text1 and Telephone1 together under Block1, nests Checkbox1 under Block2 inside Block1, and defines Block3 separately under Step1—precisely matching the panel structure. Other options either nest Telephone1 incorrectly inside Block2 or omit the top-level Step1 key, so they don’t represent the canvas layout accurately.