Final answer:
Lennie's internal conflict at the end of 'Of Mice and Men' is depicted through his hallucinations and final moments with George, showing his struggle with his actions and their implications on his dreams and friendships.
Step-by-step explanation:
Lennie's internal conflict at the end of Of Mice and Men is seen when he grapples with the consequences of his actions and the loss of his dream of owning a farm with George.
This internal struggle reaches its peak as he hallucinates conversations with his Aunt Clara and a giant rabbit, both chastising him for his wrongdoings and his eventual devastating realization that George may not forgive him.
The internal conflict culminates in the story's climax, when George decides to kill Lennie mercifully to save him from a worse fate at the hands of the angry mob led by Curley.
Lennie's turmoil is rooted in his inability to control his own strength and the impact of his actions on his future, friendship, and dreams.