Final answer:
The internal conflict in the passage is best described by Chris's worry about Keith discovering that he is lying, leading to his mixed emotions and abrupt anger as a defensive mechanism.
Step-by-step explanation:
The internal conflict represented in the passage revolves around Chris's emotional turmoil. Despite his efforts to appear casual and lie to his brother Keith, Chris is beset by guilt and anxiety. The statement that best describes Chris's internal conflict is A.Chris is worried that Keith will find out that he is lying. The passage shows Chris nervously trying to maintain a facade of casualness, while internally fearing the possibility of Keith discovering the truth. Chris's abrupt anger also appears to be a defensive reaction to cover his inner conflict and guilt about lying.