The demonstration described in this article is most likely prompted by-

a. renew diplomatic relations with Communist China
b. escalated deployment of military forces to Vietnam
c. The signing of the strategic arms limitation treaty
d. The formation of the north Atlantic Treaty organization

first option i assume

explanation:

the mexican-american war was a conflict between the united states and mexico, fought from april 1846 to february 1848.

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.  

what are you options