Answer:
Mexico was likely to rebel against Spain
Explanation:
Zebulon Pike was a former United States army officer who served twice as the leader of an expedition party during the Thomas Jefferson administration.
During his second expiration around July 1806, he was captured by the Spanish, at which time he was able to observe that Mexicans were not happy with Spanish rule.
Also is the fact that Pike observed that the Spanish government in Mexico was worried that an increase in the agitation of democracy and movement of protestant Christian doctrine is a major obstacle to their rule.
Hence, in this case, the correct answer is that Pike was one of the first to realize that "Mexico was likely to rebel against Spain."