Final answer:
Children can indeed form a market for personal trainers given the growing need for physical activity and healthy habits among youth. The market revolution is true to have brought significant changes to the U.S., and recruiting native allies was true for the Spanish conquest of the Aztecs.
Step-by-step explanation:
The market revolution brought many social and economic changes to the United States. The correct answer to the question is A) True. The market revolution was a period of significant economic change in the early 19th century where there was an expansion of markets, increased production and innovation, and changes in labor patterns. Regarding Exercise 3.2.5, the statement that recruiting native allies played an important role in the Spanish conquest of the Aztec is also A) True. Allies were critical in helping the Spanish conquer more established civilizations by providing additional military force and inside knowledge.
Now, to address the original question, "Children are natural markets for personal trainers," the statement can be seen as generally true, especially in the context of today's increased focus on obesity prevention and encouraging physical activity among youth. Children can benefit from the guidance and expertise of personal trainers to develop healthy habits, improve physical fitness, and foster a positive attitude towards exercise and well-being.