"When organizing a meeting agenda, why is it a good idea to discuss old business before introducing new business?"

c. It makes sense to complete discussion and reach decisions about old business before tackling new business.

Explanation:

For organizing a meeting agenda first we have to discuss for the old business as it gives the whole picture of the business i.e it is profitable or not that results in increase in sales of the company that reflected completed discussion.

Moreover, the organization also knows how to operates the day to day activities that are related to the functions of management

So it always it is better to make decisions for old business before tackling the new business

the answer is true.  i do believe this is the answer because of the amount of wrecks people get into each year.  if you double this with avoiding those so said wrecks, that would make you a "skilled" driver.