Final answer:
Option (D), The quote that best supports Hannibal's failure to defeat Rome decisively is about Scipio's invasion of North Africa, forcing Hannibal to retreat and lose his gains in Italy.
Step-by-step explanation:
The best quote that supports the answer to Part A regarding why Hannibal could not achieve a decisive victory against Rome is option D: "When Scipio invaded North Africa from Sicily in 205 B.C., Hannibal was called home, thus losing all the ground he'd gained in Italy." This quote succinctly states how the Roman general Scipio's actions led to Hannibal's recall to Carthage, causing him to forfeit his position in Italy and thus contributing to his inability to secure a final victory over Rome.