Final answer:
The sentence fragment 'A contributing member of society.' can be corrected by integrating it into the previous sentence, resulting in 'I had become an adult, a contributing member of society.' This forms a complete sentence with a subject and a verb, making it grammatically correct.
Step-by-step explanation:
To correct the sentence fragment in the paragraph, one must identify the independent clauses and combine them with the fragment to form a complete sentence. The sentence fragment in question is 'A contributing member of society.' The correction to this fragment would involve integrating it into a previous sentence to form a complete thought. A corrected version of the sentence could be: 'I felt like I was suddenly part of the larger picture; I had become an adult, a contributing member of society.' This now forms a complete sentence with a subject and a predicate that expresses a complete thought.
Reviewing the question's examples and rules related to 'sentence fragments' and 'mixed-construction sentences' can also help identify corrections in similar cases. For instance, the mixed-construction sentence 'By starting my general studies classes last semester allowed me to take classes in my major this fall,' the correct form would be: 'Starting my general studies classes last semester allowed me to take classes in my major this fall.'