What limitation was removed that affected the PCAOB?

The correct answer is related to the removal of the limitation for cause regarding the removal of members of the Public Company Accounting Oversight Board (PCAOB). This change means that members of the PCAOB no longer need to have a specified reason, or "cause," to be removed from their positions. This allows for more flexibility in governance and oversight, as the potential for removal without cause can help ensure accountability and responsiveness within the board.

Traditionally, such protections may have been in place to insulate board members from political or other arbitrary removals, fostering independence. However, removing this limitation can enhance the PCAOB's ability to ensure compliance and enforce standards effectively, as it enables adjustments to the board's composition that reflect the evolving needs of oversight in the accounting and auditing landscape.

The other options may revolve around different aspects of the PCAOB's governance or operations; however, they do not specifically address a significant change that impacts the board's ability to maintain effective oversight through its member governance structure. Thus, the removal of the cause limitation plays a critical role in adapting the PCAOB to better address challenges in regulatory oversight.