Rewards generally involve either cash prizes or high-value material prizes.

GInI’s framework for innovation engagement includes rewards as a reinforcement mechanism, typically categorized as tangible incentives like "cash prizes" or "high-value material prizes." These are highlighted in theCInP Handbookas effective motivators for participation. "Promotions / salary raises" (B) and "letters of appreciation / certificates of accomplishment" (C) might be used in some contexts, but GInI specifies tangible rewards as the primary focus. "New cars / vacation homes" (D) is an exaggerated distractor not aligned with standard practice. The question’s phrasing confirms A as the intended answer.