What should be communicated to arriving aircraft located outside B, C, D, E airspace when visibility is less than 1 mile?

When visibility is less than 1 mile, it is essential to prioritize safety and adhere to established regulations regarding airspace access. In such conditions, aircraft are generally not permitted to enter controlled airspace designated B, C, D, or E without specific permission, and a safe landing must be ensured.

In this context, when visibility is severely restricted, the most responsible and regulatory compliant action is to inform arriving aircraft that they must land elsewhere unless there is an emergency. This directive helps to prevent potential accidents and maintain overall safety in the airspace.

Other options suggest scenarios that do not comply with the established aviation rules regarding visibility and controlled airspace. For example, allowing entry upon request without a good visibility condition could lead to hazardous situations. Therefore, focusing on safety and the necessity to land elsewhere is crucial when visibility is compromised.