What is the correct way to express the lack of business after a factory was destroyed?

The correct choice for expressing the lack of business after a factory was destroyed is "No." This term is used to negate or indicate the absence of something. In this context, it effectively communicates that there is no business activity occurring.

Choosing "No" conveys a clear and direct message about the total lack of business in the aftermath of the incident. It serves as a straightforward response, succinctly indicating that the expected economic activity has ceased or is nonexistent due to the factory's destruction.

Other options like "Not," "None," and "Neither" do not appropriately capture the intended meaning in this situation, as they may not convey the same level of clarity regarding the absence of business. For example, "Not" would typically precede a verb or adjective rather than stand alone to indicate absence, while "None" might imply a countable quantity rather than a complete lack of action. "Neither" is often used in comparisons or to refer to two items, which doesn't apply in this context. Thus, "No" is the most fitting response.