Refer to the exhibit.

 According to the OmniScript Data JSON page, the OmniScript structure JSON defines the data elements and their properties that are used in an OmniScript. The exhibit shows an OmniScript structure JSON with three elements: Step, Block, and Telephone. The Step element is an empty object, the Block element is an object with two properties: Text and Telephone, and the Telephone element is a string. Therefore, the JSON code that correctly represents the step in the OmniScript Structure panel shown is option C, which has the following structure:

The other options have different structures that do not match the OmniScript structure shown. Therefore, the correct answer is C.