How many total DVDs sold would indicate less than 80 million in that year?

To determine how many total DVDs sold would indicate less than 80 million, we look for a value that is notably lower than the threshold of 80 million. In this case, selling 70 million DVDs is significantly less than 80 million. It directly meets the criterion of being under the specified limit, making it the only option that satisfies the requirement of indicating a sales figure below 80 million.

The other choices, such as 83 million, 90 million, and 100 million, all exceed the 80 million mark. Therefore, while they represent substantial sales figures, they do not comply with the condition of being "less than" 80 million. This reinforces that 70 million is indeed the right choice, as it is the only figure that ensures the sales remain below the 80 million threshold.