Which tool in Liferay assists with the development of services and data models?

Service Builder is the correct choice as it is specifically designed to streamline the development of services and data models within the Liferay framework. This tool allows developers to define their data models using a simple XML configuration file, which can then automatically generate the necessary service layer code. This simplifies the process of creating, retrieving, updating, and deleting data, promoting consistency and reducing repetitive coding tasks.

Service Builder not only generates the service layer but also creates persistence layers and necessary APIs, leading to a more robust and maintainable application architecture. By using Service Builder, developers can focus more on business logic rather than boilerplate code, thus increasing productivity and reducing the potential for errors.

Other tools mentioned have different purposes that do not directly relate to the development of services and data models. The Portal Framework is more focused on the overall architecture and how different web modules interact. The Module Framework is related to modular development aspects within Liferay but does not specifically handle data modeling. Theme Creator is concerned with the design and presentation layer rather than backend services or data models.