Final answer:
The most likely antagonist in Robinson Crusoe is Crusoe's ability to build tools.
Step-by-step explanation:
In the novel Robinson Crusoe by Daniel Defoe, the most likely antagonist is Crusoe's ability to build tools. Throughout the story, Crusoe's resourcefulness and ability to create tools and weapons from the materials available on the island play a major role in his survival. However, this same skill also causes conflict within the story, as Crusoe's tools become weapons against him when he encounters a group of cannibals. This creates a sense of tension and conflict, making Crusoe's ability to build tools the most likely antagonist in the story.