What did Sam do before going to eat dinner?

The scenario provided indicates that Sam engaged in an activity before dinner, suggesting he had a specific task or purpose in mind prior to that meal. The choice of going to the library likely implies that Sam was involved in an academic or leisurely pursuit that required concentration and focus. Visiting a friend may have also been a social activity, but it doesn't directly relate to preparation for dinner in the same way that a library visit does, suggesting a commitment to studying or gathering information.

Going shopping could imply a need to acquire food or supplies for dinner, but it does not inherently connect to the act of preparing for or enjoying the meal itself. Finishing homework would suggest he was engaged in a productive task that prepares him for the future rather than a fun or social experience. In this case, going to the library establishes a tone of academic diligence or focus that aligns well with a pre-dinner routine—whether for relaxation or preparation for upcoming studies—making it the most fitting choice in this context.