Background data on the local prevalence of billboards advertising alcoholic beverages would be most pertinent to a needs assessment undertaken to gather information about factors influencing the nutritional status of the community.

Environmental factors

Explanation:

The environmental factors are referred to as or known as the identifiable element or factors in the cultural, physical, economic, political, demographic, regulatory, or the technological environment which at times has the tendency  to affect the operations ,survival and the growth of a company or an organization.

the use of electrical signals that transit messages is know as