Which of the following can influence the cost increase for contract renewals?

The option addressing the original cost and current index rating is correct because these factors directly impact the pricing of contract renewals. As the original cost provides a baseline for what was initially paid for goods or services, any adjustments made in renewal negotiations will typically utilize this as a reference point. Additionally, an index rating, such as a consumer price index or other relevant economic indicators, accounts for inflation and market changes affecting the cost of goods and services over time.

When renewal contracts are negotiated, both the initial amount spent and current economic conditions indicated by such ratings can dictate whether costs will rise or remain stable. This understanding allows for more accurate budgeting and financial planning when approaching contract renewals, making it a crucial consideration in the purchasing process.