Final answer:
Standing committees in Congress are important because they help members develop expertise and facilitate the legislative process through specialization and delegation.
Step-by-step explanation:
The congressional system of standing committees is significant because it fosters the development of expertise by members, facilitates the legislative process by dividing and specializing in specific policy areas, and allows for legislative delegation. Specialization enables legislators to delve into specific policy areas, cultivating expertise that aids in understanding problems and analyzing solutions. Legislative delegation allows members to rely on the specialized knowledge of their peers in relevant committees, streamlining the decision-making process.
Regarding the question's choices, (A) is correct as committees help members develop expertise. (C) is also a valid function because committees streamline the legislative process through specialization. However, (B) is not necessarily a function of committees, and (D) is incorrect as committees do not eliminate the need for congressional sessions but rather complement the legislative proceedings.