Which tool combines the functions of a clamp and pliers?

The choice of vice-grips as the correct answer is based on its unique design and function. Vice-grips, also known as locking pliers, are a versatile tool that can clamp objects securely while also allowing for gripping similar to traditional pliers. The locking mechanism provides a firm hold on the workpiece without requiring continuous pressure from the user, making it especially useful for tasks that require both clamping and gripping.

In contrast, G-clamps are primarily used for securing workpieces together for woodworking or assembly tasks, focusing solely on clamping without the gripping functionality. Tongue and groove pliers, while capable of gripping and adjusting, do not lock in place like vice-grips do. Speed clamps, similar to G-clamps, are designed primarily for quick clamping rather than the dual function of gripping and locking. Thus, vice-grips stand out for their ability to perform both functions effectively.