At TMMi Level 3, the organisation's test processes become more structured, managed, and standardised. It requires defining and implementing a consistent set of test processes across projects and organisational units. One key factor for achieving TMMi Level 3 is the integration of process asset development.

"Process Asset Development" is directly related to establishing organisational test process assets, which is a critical element at TMMi Level 3. This practice area includes developing and maintaining organisational process assets, which encompass the standard processes that will be used across various projects. These assets are required to ensure that testing is a well-defined, repeatable, and efficient process throughout the organisation.

According to the TMMi Framework 1.3, process asset development supports the implementation of defined and repeatable processes and helps with creating guidelines for tailoring processes across the organisation. It provides the necessary framework for consistency in test planning, execution, and reporting, which are key at this maturity level​.

This practice aligns with the goals of TMMi Level 3, where the focus is on defining, standardising, and integrating the test lifecycle within the overall development lifecycle, thus ensuring that test processes are well-established across the organisation. Hence, Process Asset Development (Option B) is critical for the organisation's progression to TMMi Level 3.