Answer: B. I want to be a pastry chef, so I am thinking of attending a baking school after graduation.
Step-by-step explanation: A fused sentence is a type of run-on sentence in which two independent clauses (phrases that have complete meaning on their own) are run together (or "fused") without an appropriate conjunction or mark of punctuation between them. From the given options, the one that most effectively corrects the fused sentence is option B: "I want to be a pastry chef, so I am thinking of attending a baking school after graduation" because it uses a comma followed by a conjunction "so" to join the independent clauses.