Final answer:
Paul's initial troubles in 'Paul's Case' are academic struggles, as he rebels against the education system and feels socially isolated due to his disagreeable personality and luxurious aspirations. Therefore, the correct option is 3) Academic struggles
Step-by-step explanation:
In the story "Paul's Case", the nature of Paul's initial troubles is 3) Academic struggles. Paul is a high school student who exhibits numerous forms of rebellion against his teachers and peers, leading to a troubled experience in his academic environment.
His disdain for school is evident, and his challenges at school are amplified by his extravagant tastes and fantasies, which contrast starkly with his middle-class life. The social isolation Paul feels is both a consequence and a contributing factor to his academic troubles, as he distances himself from the society that he feels he does not belong to.