Which of the following is not a reason many industries moved south from northern cities during the 20th century? a. land was cheaper in the south b. industrial plants were often newer, in better condition, and more efficient than those in the north c. labor unions were less common in the south d. the south has more of a diverse population

D. i might be wrong but it seems the logical choice

american troops were forced to withdraw following deadly bombings.

explanation:

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.