Answer:
By showing how Scipio was too lenient and his army rebelled.
Step-by-step explanation:
Chapter 17 of Niccolo Machiavelli's (1469 – 1527) "The Prince" concerns cruelty and clemency and whether it is better to be loved than feared.
This passage explains that cruelty is necessary part of leadership. Before these lines Mechiavelli is trying to claim that the success of Hannibal was mainly because of his cruelty and not because of his other virtues. The start of this passage "that it is true his other virtues would not have been sufficient" is referring to Hannibal. Now in order to further prove his claim he gives an example of Scipio. Scipio no doubt had many excellent qualities, not only of his own times but within the memory of the man. But these excellent qualities could not prevent his army rebel in Spain, because Scipio was not cruel, and because his soldiers did not fear him.
Other options are not true because the passage is completely about Scipio's handling of his army.
Senate is NOT destroyed in this passage.
Fabius Maximus upbraided (found faults) Scipio, he was NOT feared in the Senate.
Scipio could NOT stop rebellion in his army.