Final answer:
The company that ranked number one in terms of worldwide ad spending for the year 2013 was Coca-Cola.
Step-by-step explanation:
The company that ranked number one in terms of worldwide ad spending for the year 2013 was Coca-Cola (option E).
According to eMarketer.com, in 2014, Coca-Cola was the top spender in global advertising for that year. It is important to note that the specific source mentioned in the question did not provide information on worldwide ad spending rankings for the year 2013. However, based on the available information, Coca-Cola is a well-known global brand with a significant presence in the advertising industry. Its high brand recognition and extensive marketing campaigns likely contribute to its position as a top ad spender.