Which of these is least likely an internal proposal?

The choice indicating a company policy requiring all employees to wear collared shirts is least likely an internal proposal because it does not suggest or advocate for new ideas or modifications but rather establishes a directive that must be followed. Internal proposals typically revolve around suggestions or recommendations that aim to improve processes, increase efficiency, or implement new practices within the organization.

In contrast, the other options involve recommendations or inquiries that seek to implement changes or make decisions. For example, a white paper comparing launch dates for a new product evaluates different strategies, providing analysis and suggestions, making it an internal proposal. An email requesting the purchase of a computer for a new employee may not involve evaluation or justification beyond the immediate need, yet it still represents an internal communication that facilitates the onboarding process. Similarly, a report suggesting a new training program focuses on growth and development within the organization, characteristic of internal proposals.

Thus, the choice that establishes a mandated policy without a recommendation for change is why it stands out as least likely to be considered an internal proposal.