. . . . . . . . is/are a key trend that is having a significant impact on behavior management today.

The correct answer is A: Information technology.

Let's break down why:
* Information technology (IT) is drastically changing how we work, communicate, and manage people. It affects everything from how we track employee performance to how teams collaborate. Think about tools like email, project management software, and instant messaging – they all influence behavior in the workplace.

Now, let's look at why the other options are less likely:
* Reverse discrimination is a legal and social issue, but not a primary driver of widespread changes in *how* managers manage behavior daily.
* Decreasing the amount of training for managers would likely have a *negative* impact on behavior management, making it *worse*, not reflecting a key trend positively influencing it.
* Stay-at-home mothers, while important to society, don't directly impact the core principles and practices of behavior management in organizations.

Therefore, IT is the most relevant trend significantly shaping behavior management today.